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For the rubber cup, push comes to shove, you might be able to have a machinist turn a piece of rubber down. It'd probably have to be a rubber puck put into a hole in something solid and the entire inside get cut out. It'd have to be frozen, too, but I think it's still possible. Easier than that, you might try making a mold and using silicone. The mold would be very easy to make, you'd only need a cup with the inner diameter of the outer dia. of the part, and another with the outer dia. matching the inner dia.
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