Pusher Assembly

1. I removed the magazine from the gun (3 allen-head machine screws at the front of the magazine, and 1 on the bottom).
2. The machine screw that mounts the pusher assembly requires a slender phillips with a 5/16" socket to hold the nut. I let the pusher be as far forward as it could be while still having access to the screw. The spring wants to roll up when you remove it, so remove the nut from the screw then tip the screw out of the hole keeping the screwdriver engaged in the screw head. Pay attention to the positions of the washers (I believe one goes on either side of the spring itself, and one under the nut).
3. Once the screw is out of the hole, relax the pusher against the screwdriver and slide the whole assembly forward out of the magazine.
4. Assembly is just the reverse of disassembly. I found it helpful to have my son operate the screwdriver while I controlled the pusher with one hand and held the magazine with the other. We put the screw onto the screwdriver and then fed it through the spring and into the mount hole (having placed the washers on it in the original sequence). Then my son simply held it in place while putting the washer and nut back onto it.
5. Finish by remounting the magazine onto the gun with the original hardware.