Shimming Planetary Gear Cogs

It's a solid steel pin with peened spots on the ends.
I used to rebuild those and we had a kit for it that had a punch, new pins, washers, needle bearings and re-peening tool.
We drove the pin out and replaced the washers, needle bearings and pin with new.
Even the good condition gears had what I considered way to much end play so I would shim them up to about .025 with the washers in the kit.
If you go too tight they will burn up the needle bearings because the fluid needs to be able to get in there in decent quantity to cool and lube them.

Though it would be easy to find washers to shim with, you would still be stuck with reusing the original pin and needle bearings and re-peening it.
Generally the shop rule was if they didn't move sideways or twist on the pin they didn't want them rebuilt.
(I just couldn't leave some of them with 1/16 or more of end play.)

I have since looked for a kit like I had a long time ago thinking we (FABO) might be able to rebuild some of our planetaries, but never found one.

One other thing to keep in mind is that driving that peened pin through the needle bearings can break or score things where the fixed set failed because of the repair.