Originally Posted by Jabba Degrassi

Have you checked the threads on the hub as well as the cog to make sure none of them are damaged? I have that exact setup, no problems.

Originally Posted by zac

It is a very precise fit, so make sure that the cog and hub threads are very clean. Use a tooth brush and some chain cleaner to clean both threads. Carefully inspect all around the threads to see if you have damaged them. Hopefully you haven't cross threaded your hub already. Probably not the cog, as it is steel and harder than the threads on the hub, but check anyway. If all is well, apply a thin coating of grease and carefully thread the cog on. You should be able to seat it all the way with just your hands.

Ahh, I just saw that you tried it on another hub and the same thing happened. Sounds, like you have some debris in the cog threads. I would carefully inspect them, may be a milling remnant, or maybe the thread was damaged somehow. But I certainly wouldn't be cranking it down on any soft hub threads until you know for sure.

Originally Posted by infinkc

I just got an EAI from Bens this week and having the same exact problem with my hub threading. It starts off fine but is very hard to get on without using the chain whip. Bad batch? mine is a 1/8 17t. let me know what you find out. Feels like it is x threading. Mine are on Bontragger x lite hubs. posted last night about the problem http://www.bikeforums.net/showthread.php?t=468794

Also how important is it to have a thin washer between the cog and lock ring? what do i get one from?

Originally Posted by daybreak

ah dang I just bought an EAI 17t 1/8 but have not yet installed it. I will update when I do.