It’s suppose to be in there to take up clearance between the cup and the driveshaft. Otherwise the driveshaft will have an easier time popping out/lash etc. Used to do this on the old Kyosho 7.5’s. The driveshafts were almost too short for the car I’m not sure why they do that.Is the fuel tube in the front or rear or both center diff cups? I've only found one so I am wanting to put it where it should be.
Hurricane