Started disassembly today. The quill was barely on the quill feed pinion and there was no tension on the pinion. Not sure if it is of interest but the quill has 6 splines. I got the belt cover off and noticed one of the ears for the idler shaft was broken off so I will have to replace the headstock casting. You can just see it at the top of the picture where the tab and main casting meet.
I know that different motors were used at different times so if it help narrow the manufacture year the motor is a Franklin.
1998 510 upgraded to a 520, upgraded to power pro with double tilt and lift assist.
overarm pin router