Loose door handle 41 Super Deluxe Coupe

[John K. Endrizzi]

I recently purchased a very nice 41 Super Deluxe long door coupe. Th PO stuck a king's ransom having this car professionally restored. My wife went to enter the passenger side, only to have the door handle come out of the door in her hand. Upon inspection, I found a threaded well for what I took to be meant for a set screw. After acquiring and installing an appropriate 12/24 set screw, I found that the handle would not turn. What am I missing here ?