[Ron Ramirez]

The Model 60 would not have had any rubber in its dial lamp socket originally. Philco did not start using a rubber insulator in its dial lamp sockets until the 1937 model year. Maybe some late 1936 models also - not sure at this time, but definitely 1937 to 1942.

The page Richard refers to on dial lamp socket rebuilding is indeed on my site:
http://www.philcoradio.com/tech/lamps.htm