What about working without any bumper? my dead quantum seems to work again after reading this. i found two rubbers that seemed perfect but a little bit larger so the heads went crazy

Tried with no bumpers and seems to work, btw i imagine it's no good for the physical stress. unfortunately i don't have pinch rollers of that size but i'll check if i can find something that will fit.

And yes that thing was a real gel and difficult to remove also with alcol, plus in my quantum one reel won't lift because it's integrated in the chassis so very difficult to clean and also fit something new...