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Wow! How did you find that thread??? I had certainly failed to do that, (Google failed to bring it up) and they are discussing my precise problem of both machine and space!!

Thank you for taking so much time and care!! I really appreciate that I think my questions should be formulated a little simpler: 1. Why would there be a square-section drive belt in a round-section pulley? 2. As O-rings are designed for static use, sealing liquids and gasses - can they also be...

Would you be prepared to educate me please? I am trying to resurrect a vintage ( probably 1960) Bolex 18-5 cine projector on which the three "rubber" 2mm square section drive belts had perished and there is no way I can guess at their original diameter / length The pulley sets are...