You must RE STAKE the piston wrist pin hole that you opened...delicate procedure, need some good proper sized Vee Block ( can make from wood the piston is fairly soft material, just need some stable materiel) to support the piston on it's side with hole to be staked UP.
I used a short length of small diameter Music wire (harder than the piston) laid across the hole in same orientation of the first staking and gently Tapped with the Peen side of a very small brass Ball Peen hammer....distorted just a few Thou into the hole...then test fit piston to cylinder to see If I had a burr raised and I did.... smoothed that down with an arkansas stone ( was already within reach) 600 or 800 grit paper would have worked