I got one from mills $14.00. Always debur holes on both sides of each part before final assembly. And use a good bucking bar no junk must be clean.
I have a aluminum step van and have Banged over 300 of the 3/16 brazier head rivets 50 psi is all you need
http://www.rustrepair.com/app2/onlinecat.htm?r=sv&p=wi
Maxx


52 GMC Grumman Olson Kurb Side stepvan T3-8(Comet)69 GMC 1/2-ton