[rotorwrench]

The general rule on rivet protrusion at set is 1 & 1/2 D with D being the rivet diameter but on hard rivets like steel or monel, they can get by with 1D protrusion and still give an acceptable buck tail. They don't try to push over and club foot the buck tail that way. Ford and likely the subcontractors used hydro pneumatic rivet squeezers to simplify and speed up production. Driving them with an air hammer is tricky and many times required application of enough heat to allow them to drive. 7/32 is in the large rivet category so heating them cherry red will likely be necessary. Make sure they fit the hole pretty tight or the process will be more difficult.

I've rebuilt a lot of wrecked helicopters in my day as well as riveting car and motorcycle parts so I have some experience in this task.