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Trackball replacement for Kensington



Iam using a Kensington Trackball with 55mm ball. I tried to replace it with a polished stone ball and it doesnt work. Unfortunatly the stone ball is too heavy ( stoneball is apr. 250g  , stock ball is about 100g) and it will persumly damage the ceramic guideway of the trackball.
 My question is:  Is there a way to interchange the original trackball and what kind (material) of ball should be work without damaging the trackball


A billiards ball should work perfect


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