Re: help....90% complete
How is the cable adjusted? The arm should be pushed up tight and then secure the cable stay so there is no slack.
If that doesn't work, take the cover off and smack the rod in the center of the sprocket with a ball peen hammer.
If that doesn't work, put that back together, then take off the other cover, pull in and lock the clutch and tap on the metal plate (not the gear) all around it.
Let us know what you get.