Howdy Guys, New here. Have a question about the windshield wipers in my 1950 3600. The wipers stopped working one morning and I've been working under the dash to try and fix them. The linkage is still connected to the motor under the dash, I saw that there are 2 set allen screws going from the linkage to the motor..I tightened em up and the wipers started to work a little bit, then the linkage started slipping again. Are the allen screws the only thing holding the linkage in, or is it splined as well? Any suggestions please! Thanks!