[Rob_Frey]

I used to work as a gunsmith and have drilled and tapped hundreds of these for shotgun beads. I'm surprised they shipped the kit with a #32 drill bit. This is their chart for their sight kits, and as I remembered #31 is the correct size.

SHOTGUN SIGHT KIT "A" CONTAINS: NO. HEAD DIA. SHAFT/THREAD DRILL/TAP SIZE COLOR
1 .067" 3-56 No. 45-3-56 Gold
2 .130" 3-56 No. 45-3-56 Gold
3 .175" 3-56 No. 45-3-56 Gold
4 .175" 6-48 No. 31-6-48 Gold
5 .067" 3-56 No. 45-3-56 White
6 .130" 3-56 No. 45-3-56 White
7 .175" 3-56 No. 45-3-56 White
8 .175" 6-48 No. 31-6-48 White


I think it will be tougher to tap with the smaller hole, #31 = .1200 and #32 = .1160. You might want to use some tapping fluid to lube for tapping the hole with it being smaller than the ones I tapped.

Good luck.

ETA: You will probably need to grind/sand off the bottom of the bead to make it flush with the surface of the bore.