Surface grinder wheel counterbalance t

[metric_taper]

I've found grinding wheels on eBay, most of them are severely out of balance (I think they fail some sort of receiving inspection). But I've gotten lucky to purchase some that produce acceptable surface finish. I've tried different balancing methods, and purchased a wheel balancer that's the type with that use 4, 6 inch disks on low friction ball bearings, but I don't see the friction low enough to get a wheel balanced to not create ripples in the surface.

I've tried this method from this web sight;
https://conradhoffman.com/grindbalance.htm

Problem I have was measuring the 60Hz vibration (motors running 2 pole at 60Hz power run close to 3600RPM, hence 60Hz vibration), I was using my oscilloscope in Fourier transform mode (FFT), but the software was limited (didn't want to produced good plots at 60Hz) and buggy (Rigol DS1054Z). There's just so many other harmonics (and 60Hz noise from the radiated power system, and electronic amplifiers pick that up as well). It sorta worked but was very time consuming. I purchased an accelerometer off eBay, also tried piezo speaker disks. I keep any grinders away from the machine tools, as the grit and dust is nasty. And using electronic gear, makes me cringe (in this environment) as well and has too much setup, and tear down.

I've seen purpose built fixtures that use level 'blades' of the same idea as your simple use of precision square blocks.

I'll have to make some balancing washers like yours.

Thanks for some different ideas on fixing nasty wheel balance.