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Does the platter lay flat on a table? If so the problem is probably elsewhere. One thing that might work, if the acrylic platter is warped, is placing the platter between two sheets of glass and weighting the top sheet of glass with 5-10 lb. weight. Place the “platter sandwich” in oven at 150-200 degrees for 10 minutes. See if that works. If not, replace the platter. Maybe the platter is still on warranty.
@petg60 you've confirmed my assumption that an OEM platter off ebay is likely to have the same issue.
Does anyone make an alternative platter that might work?
The OEM rubber mat lays nicely on the current platter and the wobble is very minimal - But i've tried a cork mat and an acrylic mat and the wobble became very pronounced as the mats did not lay flat. I'm most interested in trying alternative mat materials but can't seem to get them to work with my platter without wobble....
Your only hope, if you want to fix this problem without spending money, is to try the method suggested by GK. Otherwise, you have a platter that is not flat. A flat platter is a core requirement in vinyl reproduction. If one of your rigid mats lies flat such that it is plane parallel to the arc inscribed by a tonearm, then you might get away with using a rigid mat. Otherwise, I would dump the thing.
Always wondered how anyone sells a complete turntable so cheap. It has to come in something that will at least survive transportation, and so at a certain point the box it comes in becomes one of the more costly "components".
When it gets to the point where the parts are so cheap and flimsy one of the key components whose whole job is to just lay flat, and it doesn't even do that, well then Houston, we have a problem.
But you're determined to fix it for free, or at least cheap. If you can't bend it flat then here's what you do: Make yourself a new one out of MDF. Even if you have to do this entirely by hand my bet is it will be a big improvement over what you have now.
The OP has a belt drive turntable with a cast aluminum platter. The turntable’s prior owner(s) probably bent the platter by pushing it down one one side. These platters aren’t designed to withstand that kind of abuse. Given what it is, the OP could try to “correct” the bend in the platter by rotating it to the high point and gently pressing down until it turns without significant runout. Bottom like is these things are a dime a dozen, easily damaged by carelessness, and the p-mount cartridges tend to be lacklustre. With that said, a well cared for turntable similar to the OP’s turntable can produce much better sound quality than its value would suggest.