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Like Purdy says.
If you plan on re-using the pistons (most "original-original" pistons are worn beyond use unless you take steps of an expander, knurling, or other means) then you want to "back up" the backside of the piston with a block of hardwood curved to match the piston and a hole to pass the pin. Likewise, a press is nice to have if you intend on saving the pins.
Keep in mind the centerlock pistons and pins are centerlock only. Original pistons don't have "keeper grooves" in the pin-bores, and the rods are "two bushed" with a space between them to give a keeper groove for the centerlock ring.
If you re-bush the rods, DON'T forget to put the centerlock between the bushes. You'll need a special piloted reamer to do "alternate sides" and keep them in alignment.
Generally, most do the Purdy "hammer it out", discard the pistons and pins, and only look to salvage the rods for re-bushing/re-babbiting.
New pistons to match bores made to fit are SOOO much easier. And you get a "full length" rod end bushing as a bonus.
Joe K