See photos, looks like bolt holding the cammed rapid up-down wheel engagement lever broke long ago and what musta been a compression spring and cam follower escaped. There’s an unknown spring about the right size dangling from a twisted bit of baling wire, inside the rear door, bet that’s the spring. I’m guessing a half-round-head bolt cut off very short would work as a cam follower that’d stay on the spring. Or maybe it was just a ball bearing in the cam slot, there’s hardly room for anything else. There’s about 1/2” smooth shaft of the handle sticking out under the handle bracket, toward the cam groove and almost into it. Broken Bolt holding bracket on will be replaced by some high-grade bolt we have in the pick-bins already. Anyone have drawings or photos showing these parts? Even a photo showing the items as installed would be useful. But I’m going to put in what I’m pretty sure will work if nothing different shows up here within a week or two.