These damper are definately a pain in the a$$ to install but they can be made to fit. I am running one on my track car. Just make sure you have no burs on your crank and press them on by cranking down with the bolt. I didn't have much luck with using the stock woodruff key so I'm running without the key. Thus far I have not had any slipping issues.

A brake hone, a little filing on the key, and a little heat (warm up the damper to about 150/175 degree) will get them on just fine.

I used the brake hone route also, Harbor Freight 6.99 dollars and a little filing on the key. take your time and you can get the dampner to fit. Good luck

Rex

I did ~ 4min with a sand flapper on a drill + valve grinding paste and another 5 min with a brake hone without and without grinding paste... it still does not fit however it is a bit looser for the first 3 or 4mm before it jams. I am getting worried that I may not have a flat face now that I have done so much with a hand tool. This is complete BS how MSA and Powerforce can make and sell ****.

.......at this point I tossed both of mine in the dump. I didn't want to screw anything up.