Leo sez:
". . . I've never actually done this*, but it seems to me that it would be
helpful
to countersink both sides also--this would give the excess metal room to
expand and form a "head" on each end. . . ."

Countersinking would drill away metal in the center that could be better
expanded to the outside. IMO, it is better to begin striking the center
area(s) first with the ball peen, thus forcing that metal to the edges.

Bob Swinney

"Leo Lichtman" wrote in message
...

"Robert Swinney" wrote: (clip) cut it off on both sides so that it stands
"a fraction" proud of the hole. Using an anvil and ball peen hammer,
upset the bolt on both sides such that it expands and locks itself well
into the threads in the hole. (clip)
^^^^^^^^^^^^^^^^^^^
____________________
* "Cause I never make mistrakes.