Hello Martyn
I have been doing some hot rivett work on some cmp chassis today
Farming that job out i will now say you have dodged a bullet
It is a pain in the rear
not using high impact air hammers or high compression dies this job tends to be quite tedious as the heat dissapates very quickly from the rivets soon after coming out of the forge
We found today that it was quicker and neater using an oxy set ,heating ,driving 2-3 times then reheating heads then repeating the process till a good head was formed
we had a solid dolly with rivett head pattern in the end to hold the rivett in place and a hardenned bar with the same pattern in the end struck with a large hammer for the forming
with the use of high impact hammers from either side (where possible ) the job would be a lot quicker i would think