Platter wobble

So, what material is the platter? At one point you said acrylic but that was probably a typo. Maybe time to upgrade the TT.

Hi @geoffkait platter is aluminum.  My mention of acrylic platter in the first post was a typo. That was meant to say: "The rigid acrylic mat would not lay flat on the platter"

leemaze, do not bother with other mat than rubber, it is fine (rubber takes shape easier and suits your tt fine). You will benefit a worthwhile improvement by going to an upmarket tt.

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.