Hi, I figured this would be a good place to post a question regarding testing apparatus. I want to test various computer mice for performance (specifically maximum speed) and I'm looking to build (or buy) something that would be able to spin a flat disc at variable speeds. For a similar purpose I've seen someone use an old belt driven record player but I'd prefer something that I could have a little more control over. Does anyone have any simple and preferably affordable solutions? Thanks. Edit* I should mention that I'm not an engineer or physicist.