Quoted from Shredso:

I think this is one of the cases where harbor freight tools are fine. Basic cheapo roll pin set. The issue for me has always been collecting the pin. Sure, ideally you don't drive it all the way out. When it does go all the way through it typically goes for a ride. I wouldn't call my workshop the neatest, finding a tiny roll pin is no fun. I recently bought a bench block for a trigger upgrade on one of my handguns and figured I'd give it a shot with the pinball parts. It's designed to capture roll pins from a pistol and did exactly that for the plunger link. Might be a little pricey if you don't have multiple uses for it, but I don't think I'll be punching out a roll pin without it again.
http://www.midwayusa.com/product/265720/wheeler-engineering-bench-block