Search:

Peening pins is not rocket science,But certain things make it much less of an ordeal.
Look at the starrett Richard posted above,note the gentle curve as opposed to the ball of a ball peen hammer....

No need to mirror polish as I polish the pins after peening,sand out course grind marks if any.
Far easier to by one but you can also roll your own,mine are 2 OZ. hammers.
167338