When installing an updated style Left Case Race . . . I add the oiling hole, where a hole never existed. The first thing I do is measure on the inner case insert where the oil will meet the new oil hole in the race. Then I die grind a small spot (like center punching) where my drill bit will start, and drill a hole about 1/4 deep (with my chuck about touching the case). Try to keep the angle (as minimal) as possible.
Simple procedures . . . but sometimes nerve racking . . . Don't fuck it up !
Sometimes I wonder if this trade, these procedures I've been trying to learn the last few years will eventually be lost and forgotten. There's like all kinds of different things I could be doing with my life and time (still hip about time) . . . but, I feel I'm helping save a part of American-Made manufacturing that has a huge part in the glorious past of American Motorcycles, especially those wonderful years that Harley-Davidson was manufacturing an engine that would become so popular, that 70+ years later . . . youths in their 20s, 30s and early 40s were breakin' their backs and their bank accounts just to acquire one of these motors.