Good luck on that gunsmith in NC, Ira. I haven't found one in 10 years - not a real one anyway.

I have installed several of those safeties. The only real problem is lining up that pin. I use a 0.5mm lead from a draftsman's pencil. Forget drilling, you have to grind or mill that slot. Grind a tight slot and round the entrance. A Dremel Tool works very well for this job. If it isn't already blued, rust blue it.

Jim