Thanks, Chris. Here's the application. I'm interested in replacing the front bead on a Marlin 1894S with one with a tritium insert. I've spoken with Tool Tech Gunsight, and they said, "Send us your front sight and we'll see if we can drill it to install a tritium lamp, or whether a new sight would have to be built." So I need to remove the sight. I supposed I could take off the whole assembly (looks like it screws to the barrel), or order a replacement sight from Marlin (or Brownell's) and ship that up.
However, you see the complication. If they are able to install a tritium lamp for me, how do I reinstall, if drifting with a punch is not recommended for night sights? Inquiring minds need to know!