I am slowly restoring a 1950 Dodge b2b Pilothouse pickup. The newest challenge is getting the windshield wipers to work. The motor is a vacuum motor. I opened up the small compartment on the side away from the wiper connections and a small spring popped out. i cannot figure out where this little spring attaches. Most of the Dodge engineering makes some sense, but this has got me baffled. anyone else ever rebuild one of these little motors?