I purchased some lead tape that should be arriving soon to customize my new K-Factor Six One 95s. In the meantime, I was messing around it. I was originally going to add some lead tape to the handle but for the hell of it I took off the butt-cap, and saw that there's two small openings into the handle, and the handle is filled solid with some kind of foam. Anyway, on a hunch I stick a nickel in the butt and put a cap back on. I also found that I could stick a dime inside the actual butt cap which is a nice snug fit. I also found that I could put in a quarter in place of a nickel, although it's a slightly tighter fit. Once the butt-cap is on, the quarter or nickel is secure in place and doesn't move around as far as I can tell (as long as you make sure it's centered when you put it on, it stays there) although I haven't played tennis with it so it may move around with heavy activity. It may very well rattle/move around with vibration from striking a ball but we'll see. According to the US Mint, a quarter is 5.5g (a nickel is 5g) and a dime is 2.2g. So, along with adding a tournagrip (which weighs around 7g as far as the best estimations give, I have added somewhere around 15g to the handle area. The weight balance (using a finger balance measurement) has moved maybe a touch more than half an inch, which I believe translates into 5-6 points more headlight. I haven't hit with it yet, so I don't know if I even like the different balance or added weight, but I was curious if there were any negatives to adding weight in this way. It seems like a pretty simple/easy/efficient way to do it. Any thoughts?