Quoted from Toasterdog:
Weird. I've probably rebuilt flippers on every pin I've owned and never had an issue with pinballlife's kits.
When I first got into pinball, I bought all my parts from PBL, as the bulk savings seemed great. I rebuilt hundreds of flippers, but had problems, as I mentioned with the pawls bending too easily, and plungers and stoppers wearing really fast. I just thought this is how they were made. I mean, you can use the PBL ones, but you have to be careful to not overtighten.
I ordered some from PBR for the first time once, and was surprised to see that all the little screws and washers, and everything else was included, and sets where cheaper. When tightening them, the pawls didn’t crumble when it got tight (I have had PBL ones do this before the shaft was even tight enough to not move in play). I got a HUO Popeye, and went to rebuilding the flippers, right away, as I always do. What I found was that the original Williams pawls were as strong as the PBR ones, and the plunger and stops looked new as well. I could take it apart, change the sleeves and bushings (another part NOT included in PBL rebuilds, but very important in the rebuild process), and the pawls were completely reusable, unlike the PBL parts.
After using PBR rebuilds, years after I have new to no visible wear on the plungers and stoppers, but on machines that still had the PBL parts, I have had to rebuild again.
This has been a consensus with many of us, and again, search pinside for threads. There is no comparison, and Steve Young will tell you how much pride he puts into making his parts and making them exactly to the standard the original ones were.
I always state that this isn’t a shot at PBL as a whole, and I order from them for other things, but not flipper rebuild parts at all. Even their sleeves seem to be slightly larger, and do not slide nicely into b/w flipper coils.
Again, you can use the PBL ones, but given the superior quality of the PBR ones, I don't know why you would. Flippers are the single most important aspect of play, and at PBR they are like $30 to rebuild two. No brainer for me.