Cut the square off
I just mounted a new bobstay tang and used carrige bolts as I didn't want a hex head and most pan head fastners tend to be threaded the whole length or hard to find otherwise. As long as they are long enough to get something on to tighten. The ones I put in were rather large as they were pre-existing in the stem 3/4 x 16 so the fit allowed them to be tightened without having to hold the shank.
Jake
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