That is an electrical connector for an electric wiper motor. The feed wire goes in the end with the set screw. The other end snaps on the wiper electric post.
I have a NOS 1929 speedometer that I would like repaired. It is frozen up. All of the vendors just want to make an exchange. Is there someone who will repair mine?
I will be sharing my spaces RCH 9,10,11,12 (red field) with MAFCA. Alex Janke will be giving a seminar on rebuilding the two tooth steering at 10am,1pm & 3pm, on Wed, thurs, & fri. Jerry Wilhelm