The Allen shoulder bolt is exactly what I'm talking about. Ream the hole so it's a very snug slip fit, or preferably a slight press fit, to prevent movement between the parts the bolt is joining, then use a flat washer, a nut, and red Loctite to make the fastener as permanent as possible. Use a shoulder length just long enough to penetrate both of the parts being joined. It's the next best thing to a hot rivet. If any clearance is left between the bolt shank and the mating parts, they will slip and slide under suspension loading and shear more rivets.
Jerry
