What a big PIA this part is to put back in. I took the gun apart today to see why the retainer spring that hold the slide on kept getting out of alignment and making the case bulge. So I figured while it's apart I may as well buff up all the moving parts and look for burrs. My advice unless you have tiny fingers or lots of smith tools is just leave that part in the frame. Got it in very easy the first time and then looked at it and realized it was backwards. No wonder it was easy. Second time took a lot of cussing in several different languages but finally got it. Now that I have done it it may be easier if there is a next time. Anybody have a simple trick for it other than a long set of small needle nosed pliers and patience?