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Does this model have a pcb fitted, if so from what you have explained this would be the culprit, its an electronic switch some of us call it a slop start circuit which regulates the voltage
The chap is in Canada so this is a 120v machine.
The DC37 is a DC39 but badged DC37 for Continental Europe and Canada.
There should be no PCB in this machine, its a cable rewind, power switch and motor. The motor looks OK on the photo. You need to test the rewind and switch with a meter.
All you need is a cheap multimeter or continuity tester. You need to check for continuity between the wall plug and the point at which the cable rewind is connected to the motor terminals (and all points in between; the cable, rewind, and plug).No voltage required, this test is done with the machine unplugged.
"When" i get time soon i will do a basic video on basic continuity testing etc, as subjects keep cropping up.