Sony TC-WA8ESA / 1990s Dual Deck Rubber Ring Identification

Hello. I am hoping someone can help me identify a small rubber ring or gasket that I need to replace in my Sony TC-WA8ESA. However, I think this can be read as a general question for 1990s Sony dual decks. I was sold this deck and told that it simply needed its belts to be replaced. It actually came with replacement belts. Cleaning and replacing them was easy, but now I see that the real problem is that a ring or gasket that one of the belts ultimately rests on, which mediates how it moves the flywheel, has also disintegrated and is the real problem. The ring in question connects to the small pulley connected to Capstan Motor (M1) (Matsushita MMI-6H2LWK). I have attached pictures of the piece as well as where in the schematics I believe it is. If anyone can help me figure out if there is a replacement available I'd greatly appreciate it. It is my hope that it is a ring that Sony uses in other decks and is available somehow. Thank you.

Manual is located here: https://www.hifiengine.com/manual_library/sony/tc-wa8es.shtml

SONYPARTS3.jpg
SONYPARTS2.jpg
SONYPARTS1.jpg
SONYTHINGY1.jpg
SONYTHINGY3.jpg


It goes on the white ring in the middle of the image below. The belt is supposed on be placed on top of it.
PXL_20230304_183216028.MP.jpg


I'm hoping I am not SOL. A lot of these dual decks seem to need this piece and I am having difficulty finding information about it.
 
Last edited: