I NEED A 16 INCH CORK TURNTABLE MAT

@yogiboy 1+ You get cork in a roll. Relax it under books for a month or so then mount it between two 14" squares of 1/2 or 3/4" plywood. Use a wood screw at each corner 1" in. Drill a 1/8" hole near dead center then use a circle cutting guide for a router set at 11.5" and a carbide down cutting spiral bit. Cork is very friable. If you try to cut it naked it will flake apart at the edge. Once you have made the cut take the cork out and treat the edge immediately with thin Cyanoacrylate glue. Loctite Red applicator from Home Depot will do fine. I forgot to mention, before you take the cork out of the assembly take a 7.2 drill (Mcmaster Carr) and using the previous hole as a guide drill the hole out to spindle size. Good luck. If you have any problems feel free to message me and be careful. Routers can bite. If you do not know how to use one find someone who does. 

Reading Mijostyn’s instructions, I am reminded of Senior Wences from the old Ed Sullivan show: “Easy for you. Difficult for me.”

There is an outfit from Portugal that sells a cork/rubber 16" mat, die cut, for around 25.00 US plus shipping. They claim that they will do other versions. Might be worth contacting them. They are on E-Bay. 

Senor Wences, with a curl over the "N".  Not "senior".  Was having a senior moment.

I knew what you meant. 😊