Large internal boring jig.
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Previously:
https://www.homemadetools.net/forum/...573#post185853
https://www.homemadetools.net/forum/...540#post162560
https://www.homemadetools.net/forum/...029#post184080
https://www.homemadetools.net/forum/...059#post230201
https://www.homemadetools.net/forum/...884#post226456