Don't know if I posted anything here about this but you're the experts - my used-in-box unfired 360's front sight (trijicon) didn't hardly glow - I mean at all! Even in the darkest of dark "faint" is generous - so - they sent me a new one wa-lah brightness- and I'd put it in but want a back-up roll pin so what size is it? I emailed them - no answer - this will determine punch and drill size as well. On the Brownell's exploded view of a j-frame it's #20 but that's not listed as a part that I can find - any help would be greatly greatly appreciated