[Winky Dink]

I spent several days making silicone tuner mounts to replace the dry and cracked original rubber mounts…

[Image: https://c1.staticflickr.com/5/4214/35347...3a5f_z.jpg]

…and it occurred to me that I don’t know the purpose of the rubber mounts.  They insulate the rotor from the chassis, but then you need a chassis ground for the rotor.  So, what for are the rubber mounts?

And speaking of chassis grounding, this radio has a puzzling way to ground the tuner.  The wire with yellow dots goes from the ground post of a compensating condenser to the ground of a Bakelite block condenser, and then it’s soldered to a tuner-mount screw head.  

[Image: https://c1.staticflickr.com/5/4266/35437...7b23_z.jpg]

It appears to be an original wire, but I’m don’t think the factory soldered it to a screw head.  Isn’t the connection from (1) to (2) superfluous?  How was the tuner originally chassis-grounded?

Finally, was the connection to the speaker hard wired, or was there a plug?  

Thanks for your help.
- Henry