Thanks 660 this jolly is over thirty years old but still in good cond return spring is getting weak and when I first got it I ground int the chain stop and stuffed it up must make or buy a new one of those I have ownede it for 29 years and have usually tried to copy the existing chains angles but I got out of whack somewhere and it looked like I was grinding fishooks.
Your info has given me a place to go back to and start again thanks again