I'd still love to know what this "rubber coupler" is that @
click the link so it goes to the correct timecode) you will see a little rubber gear that goes between the motor and the worm. I could see this being referred to as a coupler. Maybe this is what he was referring to. I know Hyundai has had EPS problems related to a rubber gear that sits between the motor and the worm. Hyundai was nice enough to produce a TSB and sell the gear individually.