Review on Doug's Headers DEC300A-1: Ultimate Electric Exhaust Cut-Out (3-inch) by Francisco Duncan

Worn for two weeks until it didn't quite open anymore. Worked great when it was. But the engine is weak. I took it apart to check. There's a hole in the end of the motor and there's a hole in the door for it. Spring-loaded ball bearings are installed around the exit opening, along which the door slides. I see scratches on both sides of the door where it sticks. Can't tell if the door bearings are too strong or if the motor isn't strong enough.