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Antique dentist's drills, source for belts?

Hey Bob, let me know if you find a source. Mine came with a belt that is about 104" long and is too short. If you can use that I'll send it to you.
They are hard to measure with all the turns it makes.
I haven't measured yet but mine probably takes around 110" or 112".
One arm is spring loaded as a tensioner and to make installation easier so there is some wiggle room.
Mine's an Emesco.

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I used a piece of string run over all the pulleys etc. Tied the ends together then took it off and measured it. It carried enough torque to show everything rotated as it should. No real power to do any work.
Bill D