I remember complaining about how difficult it was to get the sleeve in from the bottom in front of a couple old time "builders'. They both looked at me like I had two heads. I was asking for a tip on some tool to use to get the sleeves in from the bottom and these guys both wondered why I was doing it that way. I explained that then the rubber isolator is held between the screw head and the grommet, to allow the isolator to provide vibration isolation. One of them said maybe he would try it that way. Go figure.

Now I put a stack of them on a little screwdriver and get one started, finish later with the side of a larger screwdriver blade. Some guys make a tool from tubing and wire, to capture and insert just one at a time.

Good luck,
Dave Olson