The beauty of the Briffidi is the absolute simplicity. And it actually is rotating around the correct axis. I don’t think there is another machine on the market that rotates on the Y axis for twistweight. Which removes nearly all of the mounting error. Anyone?
Metorlab - Tennis Swingweight Machine
Metortune brings nextgen tuning for your tennis/badminton raquets. Measure precisely swingweight, twistweight, balance + advanced autotune software

What generation are your regnas? Some Regna thread talks about one generation being around 14 and the other around 13-13.5 so maybe that explains it.I thought mine sounded low compared to yours but my machine was still measuring my SW accurately. To be sure, I just recalibrated it. It was off slightly. My calibration rod should measure 297.1 and was now measuring 296. I recalibrated it and remeasured. The v2 Regna 98 I had measured just before calibrating went from 317 to 318 in SW. The TW measured yesterday was 12.84 and after recalibration it is now 12.87. So they were off slightly but not enough to make a significant change.
The regna I played definitely wasn't that low on TW.
Would be nice to have a briffidi to compare numbers between machines directly.
Some threads on the forum said that it's in the 14-15 range so that's what I was going by. Guess that poster was wrong, my bad.The FX500 Tour is a 98 inch frame with a 21/23/21 beam width. TennisWarehouse measured the SW at 317. Mine was way below that. I added 3g of lead at 12 to bring that SW up to around 320 strung. I don't know much about twist weights but this frame isn't that different than some of my others besides the beam being less box and more tubular.
Under 13 it gets rather unstable imo.Yeah, the Briffidi is stupid easy to use. Just have to make sure you're careful when mounting and make sure there's no wobble. I just recalibrated and remeasured. My numbers were off by .03 so they went up a tiny bit.
I'm still in the 13 range. I think I just prefer lower twist weights than most. That would explain why I've always gravitated towards thinner beam control frames. And why I like frames that come through the air fast while others that folks on here have liked have felt sluggish to me. I never knew why but for me TW may have been the answer.
The only frames I still have to measure are my TF RS 300's. One of them is unstrung so I was going to wait but out of curiosity I may just measure the other 2. If my hypothesis is correct I'm thinking these will be in the 13.5 range.
I heard rather bad things about the Head 4-in-1 prototypes with regard to TW. A friend went to an ERSA conference and got that info from some stringer there.There is a new Head 4-in-1 with twistweight measurement about the handle axis. I haven't been able to find much about it, just some videos from Pickleball Central. It has a nice, new racquet clamp.
The only other one that I know of that measures twistweight is the MetorTune, but it uses the approximation of spinweight minus swingweight. The MetorTune should be repeatable, but the results will be lower than actual (unless they attempt to compensate via software). If you're curious, there's a blog post on my site that discusses twistweight from the difference between spinweight and swingweight. I found that error to be around -0.4 kg·cm² for a CAD model of a racquet.