[Crex]

If your pins and holes are sized correctly as Jim has suggested, just roll the pins under a coarse cut file to "knurl" them up full length. If you are using quality epoxy, you will find you have to either drill them out or destroy the handle to remove. No need to peen.
But.....if you feel you just have too.....what Damon said. Just don't hit them that last time for good measure.
Also annealing the pin material helps alot with brass, copper, & nickel silver. Just heat them to cherry red and plunge into cold water (opposite of blade steel). This will make them dead soft.