My Feet Hurt

I bought a really nice Thorens TD-145 turntable and one of the feet needed replacing. Since the original feet are really horrible, I ordered a replacement set that were more substantial, but still designed for Thorens tables. After installing the new feet, the platter will not turn. The screws for the new feet were a tad bit longer than the originals, but I don't think there are any critical parts near the corners where the feet are located. Any ideas on how to trouble-shoot this would be appreciated. I'm thinking of removing the feet completely and installing silicone rounded rubber bumper feet/pads on the bottom board. The table worked fine before I replaced the feet.
Thanks for the tip....that was the first thing I did. The seller of the feet (who also repairs Thorens) suggested I check a switch that controls that function. That's my next step, but I don't see how replacing the feet would have caused a problem with the switch.
That is a great question and I thought about doing that....only problem is
one of the old feet was so worn (the rubber), the screw-head scraped the surface beneath. So I think I tossed them, or at least the offending one. If I find the other three, I'm going that route to see what happens. I almost never throw anything stereo-related away, it's just a matter of locating them among 3 boxes of spare stuff.