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Each motor is tested 100%. Testing includes loading the motor on a simulated window fixture to verify speed and strength of the motor. Every motor has its internal components inspected and gauged. Bushings are gauged and re-impregnated with lubricating oil, ball bearings are replaced with new and armatures are fully tested to ensure insulation.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.