[lincpimp]

I had some tin coated bits, but cobalt one would have been better. I actually like the slots, as they let the screw angle a bit, which aids in getting the nuts on. Not much room to work with, I had to use pliers to hold the nut as I screwed it. (can't wait to hear what everyone thinks of that last sentence)

I used a bench grinder to grint the teeth off, then put a screwdriver shaft thru the hole in the spur and held it against the grinding wheel. I used another plastic handle to slow the spin of the spur, and that evened out the area that I ground the teeth off. It is almost perfectly round, and that does not really matter, as nothing touches that edge.