I found these drawings of  frame rivet tools on the g503 restoration board.
They were in response to a thread on using rivets.

The specific thread was at :

You may be able to find them at  http://jeepdraw.maryboroughqld.com/  by now with more details.


frame-repair-1.jpg (19762 bytes)  frame-repair-2.jpg (22742 bytes)   frame-repair-3.jpg (25355 bytes)  frame-repair-4.jpg (18219 bytes)

Drawings were by a Paolo Batisti from what I gathered in the message link above..