I put the key in, and put the front a little lower than the back, and I mean a little. Then I line it up and slide it on enough to engage it. I have an installation tool I made out of a section of Acme thread rod, an Acme threaded nut. I got a bolt the same thread as the damper bolt and cut the head off. I drilled both the rod and the headless bolt for a pin and then put them together using a pin. I then welded the rod and the headless bolt together. I use a section of roll bar tubing with a welded on flat stock to push the damper on as I tighten the acme threaded nut. Works like a charm.

Mike