Michael, sounds like these repair guys have no idea what they're doing. I know your frustration, I feel it, too. There are so many little adustments that make huge differences in sound when dealing with turntables. When I found my Pioneer PL-41 turntable, I took it to a local expert audio shop to get a new cartridge, and get the thing tuned up. Turns out they missed a lot of things (including installing a cartridge that really didn't work with the arm!). I've learned a lot on how to set up turntables from the web, and in talking to various people. You absolutely have the mechanical aptitude to learn too, but it sounds like you're at the end of your patience.