Well, after much to-ing and fro-ing, I think I'll use a bolt, and there's a few reasons for that. One, the cap is on tightly in it's register and it's pin and two, the factory thought bolts were satisfactory. Three, I have no easy access to a milling machine to cut down the cap. But here's a question- the factory torque (on bolts) is 85 lb/ft, but I have Pioneer studs and in conversation with Pioneer's tech dept. they recommended 130 lb/ft! I don't want to pull the threads out of the block and wonder if anyone else has experience in this regard?