You need a bubble level and some shims to insert under your TT feet. I've used layers of electrical tape with good results, but anything will work. It just needs to be thin so you can gradually increase the height.
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If you have a turntable with soft feet, the above methods would be fine. If you have a turntable with hard feet or cones, using soft shims may affect the sound of the table. I use a 3 1/2" thick maple platform under my turntable. To level the platform, I installed brass 1/4"x 20 threaded inserts. Then, I used a short length of threaded brass rod to install Black Diamond Racing footer cones. Each corner can be adjusted very precisely.
It wasn't cheap, but I had my Thorens TD-166 Mk II modded by a local guy. He removed the stock feet, and replaced them with threaded bolts, terminated with rubber balls glued into inverted cups, which act to absorb vibrations. I now have a couple of inches of adjustable leveling range, which I need due to my very uneven basement floor. Email me if you want info on this modder - he is in New Jersey.