You use them to align the flippers. Push em up, adjust the flippers, back down for gameplay.

I would save them. They are a nice and easy way to help with flipper adjustment.

*Edit* after the discussion in this thread, I wouldn't suggest putting them back in a new playfield. When I read the op's question I missed the playfield swap part.

They move up and down easy. You can also use the pick or allen. It's all good either way.

Ok, you tell me. Why the heck would they bother to put roll pins in there if they weren't supposed to be moved? I mean lots of games had the holes, but no pins.

And why would you need a hammer to move a roll pin?

Look, back to the original question. Those pins were installed at the factory for the purpose of adjusting flippers. You can still use them to do that. I've yet to see one that needed a hammer to move. If you don't want them to adjust your flippers don't use em. I happen to like games with them. I push em up, usually use the handle of a nut driver, adjust my flips, and push them back down.

What moron did you see hammering the bottom of their playfield? I hope you smacked em.

Then use a punch not a hammer. lol

I think we got off track here. Obviously if they don't move easy you shouldn't force them, especially on a new playfield. The fact remains though, they were originally there for flipper adjustment, which was the initial question. Now Leo13 is right, I wouldn't bother putting them in on a playfield swap. On in old playfield however I find them beneficial and have never had an issue moving them up and down.

No argument here.