Rivet Guns
They come in a number of sizes. I believe it's up to 4x that uses a .401" shank (same as muffler gun), above that it's .498". With the larger shank size, you can buy a grade 8 bolt and make your own heads. For Kent's that uses the plastic inserts, I've been making the inserts myself, but use his holder.
The issue with making your own heads is that the raised area the spring uses to retain the head, isn't there. You have to hold onto it, or it will spit it out. I guess you could make your own raised area, but I've never tried that.
Put a regulator in line, you'll get a lot more control.
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John
Ron Covell, Autofuturist books (Tim Barton/Bill Longyard) and Kent White metalshaping DVD's available, shipped from the US. Contact lane@mountainhouseestate.com for price and availability.
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