Don't know what the leadscrew has to do with motor longevity, but if concerned with debris getting into the control box (a possibility) and shorting electronic components:
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LMS Part number 2562? ---? Lead Screw Chip Guard? ---? $2.89
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https://littlemachineshop.com/products/product_view.php?ProductID=2562
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Lone Tree, Colorado? ?USA
