Whilst we are on the subject,got to dinkin around as was a thread last week about using a spoon.
So I took one, melted some Cerro bend (you could use lead, I have a bunch and it melts at 158 degs)poured it into the spoon, when it hardened took it out and super glued it in place.
It works very well but more suited to tightening lose pins than peening new ones because you do not have the same visual.
It also is pretty flat so you get zero peening marks,love home brew tools