I saw this thread a few days ago an ordered some #12 and #10 drive bolts. I just got the #12 bolts today in the mail. The heads of the #12 bolts are A LOT larger than the heads of rivets. I'll let you guys know about the #10 bolts when I get them.
I just drilled a 9/64 hole into 1/8 piece of hard steel and drove a 1/8x 3/8 u tyoe drive screw into it to test the holdign power. It will never come out that I can see. I will use the 1/8 X1/4 to build for real. Wow! what a hold it has on that steel.