I have a 1977 35 HP Evinrude (pull start) and when attempting to start the rope keeps slipping, I have attached a picture of the plastic part that bolts to the outside of the flywheel, (not sure the name of this part...if anyone knows please tell me) the plastic part is wore down to where it is supposed to catch on the notch inside of the flywheel. Bottom line - not sure if this is the issue but would like to know the best way to locate these parts.