I dont't know of Shenandoah restorations...
The back bracket is a very easy repair - I did it myself on mine and I am not what anyone would call handy with tools. The arm itself is brass with a very thin gold wash on it. Unless it is badly worn, I would just gently clean it with mild soap and water. I had one machine that I bought on ebay - somewhere between the time the photos were taken and I got the machine, they decided to polish the arm and in the process removed all the gold - it is shinny but not the right color at all! Eventually, I want to find a donor machine to get another one. Rebuilding the reproduceris a bit tricky - especially if it is one of the older ones made out of pot metal. Whenever I get a new machine, I always like to do as little as possible with it to keep it as original as possible.
You should be able to get the machine playing accoustically with very little effort. Do you have the book "Look for the Dog?" It is a great reference for all the Victor products and even has repair notes that were used by the service techs of the day to explain how to repair/maintain the motors, reproducers (sound box), etc.
Best of luck with your machine. It is a very rare example - less than 3,500 of this model were made as opposed to ~90,000 of the other "Credenza" models. I only know of 5 or 6 of them left in existance.
Please try to keep it as authentic as possible.
Regards,
Alan