"David Billington" wrote in message
...
On 06/10/2019 20:06, Larry Jaques wrote:
On Tue, 17 Sep 2019 17:41:36 -0400, "Jim Wilkins"
wrote:
..................

Not sure I'd agree about drive pins, called U drive, being
permanent, they're easily removed with the right tool like a small
cold chisel with a gap to go around the shank. They're often used
for engine number plates on some older British engines and get
removed when the block is decked.

I collected worn and chipped diagonal cutters at work for that sort of
task. They grab round heads and broken-off stubs better than
Vise-Grips.