I have taken the rear carb off to correct a malfunction and discovered that the spring (accelerator) with the ball bearing at the bottom of does not seem to sit straight on the ball bearing because there is a small structure about 1/8th inch round that sits next to where the bearing sits, this prevents the spring from sitting/seating flush with the bearing.
It is definately a structure and not a molding burr.
Does anyone know what that the purpose for that is? and is it suppose to be there, I could not find it in the shop manual.