my local Ace rocks..... far better hardware selection than the depot or lowes.... usually i order stuff from Mcmaster (which if i order before 9 a.m, i'll have before 5 p.m, the SAME day!) especially oddball stuff..
but i've stopped in there many times on a sunday, and have been pretty impressed with their odd, and metric offerings....
Gotta try another local tomorrow. Getting those really only helps me get them pinned.
How hard would it be to have a machine shop drill/tap the center of the head? Then i coudl thread in a smaller security head to cover the Allen head....