Thanks! I think that many here know this but for those who don't, here are some pointers, lessons learned the hard way.
For many if not most lapel pins and tie tacks, the pin on the back side is not centered. If you want to locate the pin precisely, you have to measure precisely. Then drill a small hole such that you can place the pin on the stick, just where you want it. If you plan to use a forstner bit later, this hole may be located in a different place than the center of the forstner bit hole.
Often, adjacent to the pin you will find a tiny tab, probably intended to keep the pin from rotating on your tie or lapel. Bend it back and forth until it falls off.
Finally, around the pin there is often a raised area of perhaps 1/8" diameter and 1/32" (?) high. That causes no problems so long as you know that it is there and therefore your pin may not rest flat on a flat surface.
If your inset hole is larger than the pin, some will add dye to epoxy to make that pin really pop. This is really tricky, as too much dye will dull the epoxy surface and slow the setting up time immensely. Do some experimenting if you want to try this.
Hadn't occurred to me that the pin might not be close to the center. Very good to know that.
My wife and I have been members of a an Izaak Walton league chapter for some time. I've considered offering some of my sticks to the Ikes, as well as to a nearby nature preserve, as a fundraiser token. The Ike's have a little pin that anyone can buy.
I figure that if I inset one of those pins I can offer an (get ready) 'Iking stick! (groan)