need parts for a Silvertone Tru-phonic phonograph

I need a tone arm for a Silvertone Tru-phonic phonograph. The reproducer is fine, but the tone arm is articulated (double jointed??) - it swings left to right at the base, and has a pivot in the center to flip it over so the needle will contact the record. Mine is broken at this pivot point, and it allows the needle to sit too deeply into the record and slows the turntable, pretty much to a stop.

Let me know what you have by way of replacement parts. This old phonograph came from my wife's grandparents, and I'd like it to be functional, and fixing the tone arm will make it 100%. I'd like for it to be more than just a piece of furniture. Thanks very much for your help.

Note that this slowing of the turntable also happens if you use a worn needle, with styrene records, or if the records were made after around 1932.