making a specialcork platter mat

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I have a pioneer pl-c7 front load turntable. It was missing the rubber platter mat and is unobtainium (unless somebody here has one). So I decided to try making a cork mat for it. It is special in that the inner hole diameter is 4.1 inches and the outer diameter is 7 inches (like ring). I don't know how to accurately cut the cork and keep centered and round. Any ideas?
Joel Henry
 
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