[ccomer1955]

Gary at "Playthings of the Past" has a Mallory replacement for that pot. The Mallory book shows it as Philco part 7439 and the Mallory replacement is Mallory part Y with Mallory switch 6 added. A note in the Mallory book says "left hand terminal must be grounded to chassis viewed from shaft end,terminals down."
If you ask him, Gary might even have the Philco part that won't need the added switch. Read Gary's homepage for ordering instructions and follow them if you decide to get in touch with him.

http://www.oldradioparts.com/potmanuf.txt