¼" per foot is standard taper for pins used in assembling many machine parts with these pins beimg availabe in sizes #6/0 @.078" dia (large end) through #10 @ .706" dia (large end). These pins can be had in lengths varying from as short as 3/8" (#6/0) to as long as 6" (#10) with sizes suitable for hinge pins in between. Thanks for pointing out this article Jim, as a retired machinist, interested in seeing his set up.
RedHawk;
The pins are a uniform taper for full length through the frame. I have seen some old guns which had a taper for the width of the lug, with cylindrical portions through the frame on either end. Many ols single bbl guns had the pin threaded into the frame on small end with a taper beginning at end of thread across lug. These often had a "Lever" attached at large end for turning in which folded down into a recess cut in side of frame.
PS; ¼" per foot = .020833" per inch. What surprised me on the LC's was the .018"/inch on the R frames. Perhaps it was designed prior to standardization of the taper pin.
