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Does anyone know the best durometer hardness for the O-rings on the target rollers? And where and what size hole to pin the hydraulic motor to keep the magazine in time with the elevator? What works the best, roll pin or set screw? Someone had pictures of what to do on here a long time ago. Did a search and didn't find anything.
 

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70A is what I use with good results.

Buna-N (Nitrile)

Here is a chart with the relative softness of the numbers.

http://mykin.com/rubber-hardness-chart
 
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