A quick review of the manual I have shows a brief reference to a "shielding pin" and a "contact spring". Nothing else mentioned that I saw. Must have been some sort of attemp at dumping built up static energy from causing radio interference???
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72
'02 CLK320 Cabriolet - wifey's mid-life crisis
2012 VW Jetta Sportwagon TDI...at least its a diesel
Non illegitemae carborundum.