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Discussion Starter · #1 ·
Why do the PC guide bushing sets always have a 51/64 OD bushing., and not, for example a 7/8 inch OD bushing?
 

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Discussion Starter · #4 ·
I believe that the 51/64" guide is used for the P-C Hinge Mortising Jig.

Thanks very much @tomp913. That makes sense for why there is a 51/64 but does not explain the absence of a 7/8 in OD. I looked up PC hinge mortising jigs and saw mention of the need for such a guide bushing however.
It is 20.24 mm, a little to far from 20 mm for tight fitting joints, etc,
 
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