some tools that your going to need are a hammer, some punches 1/8and one smaller

staret bt marking the place of the old piston rivet with a center punch
next start drilling out the old rivet

next start knocking out the old rivet with the punches

next remo0ve the old piston and replace with the new piston and drill  new hole if needed


old rivet new rivet tap in the new rivet , the new rivet should be very tight ,find a hard flat surface to hammer flat the old rivet

use a dremel sanding insert to sand the new rivet and this should make new rivet even and unnoticible