Originally Posted by
SortaGrey
By threading a 5/16" bolt into the frame hole. Seem to remember the dude at the hardware store commenting it was common threading.. meaning I believe 18 tpi.
So you're going off the word of the hardware store dude using an imperial/SAE bolt? common threading indeed...
A 5/16" bolt "may" work on a frame boss but that doesn't mean it'll be ideal. Bike hardware is usually metric, brake studs usually M10. Get the brake stud from Paragon Machine (older version), thread it into the frame boss and continue the bike build.