"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)
^^^^^^^^^^^^^^^^^^^
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.
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* "Cause I never make mistrakes.