for a 3/4 inch nipple, ......ummmm 3/4 inch drill bit??
You gotta understand whos talking here, I'm "mechanically" disabled"!
I actually had all 4 1/2 inchers, but now I have one 3/4 inch nipple, why? cause the hole I drilled became too big after I filed it down!!
I tell all my buddies its all in the design plan, and its critical to have that one 3/4 inch nipple!