Vintage door knob jig.
https://s3-us-west-1.amazonaws.com/h...e_fullsize.jpg
Previously:
https://www.homemadetools.net/forum/...904#post198695
https://www.homemadetools.net/forum/...847#post198462
https://www.homemadetools.net/forum/...740#post124087
https://www.homemadetools.net/forum/...193#post195778
https://www.homemadetools.net/forum/...034#post195086