At a workshop being taught by Jack Sobon at Hancock Shaker village, he told us the reason he picked the 13/16" size for his peg "holes" was that he got a deal at a hardware store close out sale on a whole big box of 13/16" bits. That was the reason he's using that size.
He had us split our pegs from straight grain red oak stock and then trim them to size on a shaving horse with a draw knife.
His shaving horse had a series of different size holes in the seat, for us to use to 'test' the size of our eight sized tapered pegs.
Good luck, Jim


Whatever you do, have fun doing it!