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If you have a 14 cog pulley this is the correct part
This is a Worm Gear Retainer Replacement Kit
Replaces steel rollers
Liftmaster 387LM Universal Garage Door Wireless Keypad
LiftMaster 041A6104 Cable Tension Monitor - 8500C 8500W 3800 If you have a 14LiftMaster 41A6104 Cable Tension Monitor For 3800 3900 8500C 8500W CABLE TENSION MONITOR KIT 041A6104 is a one piece cable tension monitor kit. This replacement kit is for use with various RJO wall mounted garage door openers. Replacement kit includes 33" of wire. Also known as 41A6104 Cable Tension Monitor for Jackshaft Openers
US$ 29.06
US$ 20.73
