High Density Foam Handle Dampening Modification

bobombom

Rookie
Hello all,

I just wanted to share something I decided to try the other day. The title sounds much more sophisticated than what I actually did. Much to my dismay, over the past few months, I have been dealing with tennis elbow. I never thought it would happen to me, but unsurprisingly, my arm was not as indestructible as I had hoped. With the hopes of improving my arm pain, I perused almost all of talk tennis looking for handle modifications (I don't think this particular type of insert has ever been discussed on these forums). I had originally decided to do a silicone modification just to see what all the fuss was about, and I actually had the tube of silicone in my hands at the Home Depot while walking towards the line when I saw a section for piping insulation. There were pieces of foam ranging from low density to high density, and the high density foam was soft almost like memory foam. Since a piece of foam was much more of a temporizing measure than silicone, I decided to purchase the foam instead. I also purchased some putty to increase the weight, since the foam itself wasn't too heavy.

I cut the pieces of foam into longer strips (that I could squeeze into the handle) that weighed around 2 grams each. After removing the foam that came with my racquet and the nails that I had embedded, I squeezed the pieces of insulating foam through the handle with a flat head screwdriver. After they had been sufficiently inserted, I used the putty to bring it to my desired weight.

I went ahead and hit around a bit, and much to my surprise, I could hardly feel any vibration. I was wondering if it was all in my head, so I pulled out a matched racquet that I had not added the foam to, and the difference was pretty marked. There was not really a difference in feel, or any addition of a "rubbery feel" or anything like that. The only difference I noted was a clear decrease in the amount of vibration. Balance stayed the same as it was easy to manipulate the weight. I obviously can't compare this to silicone, as I have never tried it before, but I personally consider this modification to be a success.

I wanted to post pics, but due to my lack of web savvyness, I will have to delay posting pics until I figure out how. Not to mention, the pics won't be wow-ing anyone by any means. Hope I can inspire some people too scared to try silicone to give this a go.
 
For pics take pictures, upload them to your computer or mobile device, then upload them to an image hosting site (I suggest imgur, very self explanatory), and then post the generated link into the image tab (the button with a landscape image). You'll then have embedded the picture into your post :)

So this was already hardened foam rather than foam you can inject?
 
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I don't see it, how much grams of foam did you add in total? And how much total in handle?

As for the effect, it doesn't surprise me at all.
 
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For pics take pictures, upload them to your computer or mobile device, then upload them to an image hosting site (I suggest imgur, very self explanatory), and then post the generated link into the image tab (the button with a landscape image). You'll then have embedded the picture into your post :)

So this was already hardened foam rather than foam you can inject?
Great, I will try that later when I have my laptop. It felt like a piece of memory foam that I compressed into the handle. It was advertised as a shock absorbant, temperature stabilizing foam, so I figured why not.
 
I don't see it, how much grams of foam did you add in total? And how much total in handle?

As for the effect, it doesn't surprise me at all.
Yah, I expected some vibration dampening, but I got a lot more success than I thought. Maybe because I pushed the foam up pretty high and put in putty at the end for weight. I put in 4 grams total of foam.
 
Yah, I expected some vibration dampening, but I got a lot more success than I thought. Maybe because I pushed the foam up pretty high and put in putty at the end for weight. I put in 4 grams total of foam.

You can pull out putty and then try hitting to see how much effect is because of foam.
 
I don't think the foam will prevent elbow injuries. Only lower flex could prevent arm injuries.
There has been some research between foam filled and hollow rackets and the difference is actually negligible.

http://acoustics.org/3asa11-hollow-...vibrations-kritika-vayur-dr-daniel-a-russell/
I think you should add the caveat that this study is inconclusive. Preliminary data means very little in changing medical practice guidelines (unless it has to do with a highly morbid condition), and it would be difficult to apply this to actual medical practice. I don't doubt that handle vibrations is probably menial in the grand scheme of tennis elbow. Being a physician myself, I understand the pathophysiology, but messing with my racquet is my only solace while waiting to play seriously again. One thing for sure is that my hand feels less discomfort after the vibrations got attenuated by the foam. Will this help my elbow? Who knows? Does it make me feel better in my head? A tiny bit, but yes.
 
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I used to insert high density foam in my pure drives , then aero pro drives. I feel like it made a difference and was easy to match weight of frames with the foam.
 
Okay, let's give this a shot... Nothing fancy in these pics.

This is the foam itself. Very soft, compressible, and smooth. Think memory foam but more dense.
IMG_1102.jpg



I cut them into smaller pieces and weighed them out. I actually trimmed them a bit more, but I didn't get a pic.
IMG_1106.jpg


This is after I inserted one side. I used a flathead screwdriver to feed it in.
IMG_1101.jpg


Weight before, and after foam and putty.
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Took a total of 5-10 mins, and I'm pretty pleased with the result. Much better than the long screws I had screwed into the PU foam.
 
I have no clue what foam is inside my Angell racquets, but they feel amazing. Glad to see people thinking outside the box. I just siliconed a few frames the other day, and I feel like it made a definite improvement. But poster putty works very well and is easily reversible (I am guessing that's what type of putty you put in)
 
Good idea!

Tried something similar a couple of times. Got the expanding foam in a can and tried that in an APD. But it was obviously much higher density than what wilson use in their racquets because it worked TOO well, practically deadened the racquet. So then i tried the little foam bean bag balls you can buy cheap, i just stuff then inside the handle and push them in to fill up the handle. Adds about 5 grams and works well so i do it all the time now. But im interested in trying this!
 
I wonder how well this would work with a racquet that is completely hallow in the handle? It looks like yours still has quite a bit of the original foam in it.
 
I wonder how well this would work with a racquet that is completely hallow in the handle? It looks like yours still has quite a bit of the original foam in it.
I used to use a firm light packing foam to fill my APD. It came in sheets that you could cut to size. Worked great.
 
I've used furniture foam and cotton as well. I have my doubts that it makes much of a difference in regards to vibrations, but it's definitely a convenient way to add weight to the entire handle if that's what you're looking to do. Plus it's easily reversible, unlike silicone.
 
So what were the things you noticed after filling your APD with the packing foam?
It wasn't a major difference in feel other than the vibration frequency felt shorter, a bit more muffled, and my shoulder would not hurt as much after I played. It felt less powerful. It is hard to quantify but I definitely felt a difference.
 
It wasn't a major difference in feel other than the vibration frequency felt shorter, a bit more muffled, and my shoulder would not hurt as much after I played. It felt less powerful. It is hard to quantify but I definitely felt a difference.
Also it was packed in very tight so it would not Shift at all in the frame.
 
Has anyone put some metal shot or grains of rice into the handle and made your own PK Kinetic handle? (Of course, you'd have to first shove some cotton or something to keep the shot from traveling down too far).
 
Less powerful? That's interesting...I don't see how that would make the racquet less powerful.

But obviously the comfort was better...so that's good.

It wasn't a major difference in feel other than the vibration frequency felt shorter, a bit more muffled, and my shoulder would not hurt as much after I played. It felt less powerful. It is hard to quantify but I definitely felt a difference.
 
Less powerful? That's interesting...I don't see how that would make the racquet less powerful.

But obviously the comfort was better...so that's good.
I don't think the frame was less powerful, it just felt that way.I know it sounds weird but it Was very slight feeling of more control.
 
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