A while ago somebody was interested in how stem inserts and end caps are done. Seeing that at that stage I was busy with a pipe that was going to get a shank ring, I thought I might as well put a couple of photos together and show how I do it.
An off-cut piece of briar is then faced and drilled with the same bit and with a tiny bit of CA glue on the tenon, glued to the shank.
The secret is to use only enough CA glue to keep the piece in place, but not too much so that you'll struggle to get it off or worse, break the shank!
Normally I will start on the stem now, until completed, then stamp the pipe and polish and wax.