Thanks for all of the help getting to the bottom of this. The yoke clearly needs to be replaced, I don't know if the picture shows stops or not but I do know I can't get anything past that point. Now I am trying to figure out what size yoke I need,measuring top of cap to top of cap I get 56mm, cap diameter I get 24mm. These measurements don't match up to any of the series measurements I have found. Any ideas on what size yoke I need?