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Re: Worm Gear?
If cost is an issue, you can use non-precision or low-precision lead screw material. This costs up to 50% less than precision material, which can be had with accuracies better than 0.001" per foot. Even regular hardware store "all thread" threaded rod can be adequate if accuracy (less than a few thousandths) is not required.
If the price you find is OK, though, just buy it.
Don
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