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Discussion Starter #1 (Edited)
Roland Sands Valve covers. Can't get off by hand force alone. Is there a special tool? If not what size allen might this be? Id sure like to use a polymer allen as opposed to steel. I don't think allens exist in any other material other than metal, at least I cant find any. Measurement: Without using an inside micrometer I get about 9/16 - .5625in - 14.28mm
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Thanks!
 

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If you're worried about marring the finish, a layer of thin tape on a metal hex drive might help. Or, (dangerously), off the top of my head, maybe a layer of thin aluminum sheet inside the socket there with whatever size hex might fit in that.
 

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Just try several Allen keys until you get the tightest fit, then put an extension tube over it for leverage, make sure to turn it the correct way.
Cheers,Ken.
 
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