FredC wrote on Dec 16
th, 2019 at 10:56pm:
. . . Parashooter's trick will make the "B" cam higher. I do not know an easy way to make the "A" cam higher. . .
First off, let's get away from the "A" and "B" business before we confuse the recruits. Those letters are in my picture (shown at bottom here) only to provide a ready reference for someone looking at that individual image and text. In general usage, those two elements of the trigger are called "front hump" and "rear hump" (except Lee-Enfields, where it's kind of vertical and we have upper and lower humps
).
Please note that the "trick" is needed only if one wishes to avoid altering an original trigger. If that's not a problem, we reduce the
second stage by stoning the
rear hump where it contacts the receiver at the end of the first stage take-up or reduce the
first stage (and lengthen the 2d stage) by stoning some height off the
front hump. (Stone both too much and go find a new trigger!
)
Here's an image of the US M1903 trigger - different layout, same two-hump principle: