OK, just to confirm, break any sharp edges (there aren't many), use oily fingers to drop plunger into hole, with the flat side presumably facing "in" (not to the front, back, or sides). I'm trying to think of a way to test that it goes up and down, but it will probably just "work".
Insert spring, and use a piece of black electrical tape to hold things in when I turn it sideways so I can use a punch on the other side of the slide to start moving the rear sight in, without the parts falling out.
Eventually the slide will be back where it belongs, so I put the small set screw in and snug it up.
I guess this would be a good time to see if the firing pin moves in and out regardless of whether a magazine is in place.
Insert spring, and use a piece of black electrical tape to hold things in when I turn it sideways so I can use a punch on the other side of the slide to start moving the rear sight in, without the parts falling out.
Eventually the slide will be back where it belongs, so I put the small set screw in and snug it up.
I guess this would be a good time to see if the firing pin moves in and out regardless of whether a magazine is in place.