Review on 🔩 LiftMaster Screw Drive Coupler 25C20 - Chamberlain Craftsman Garage Door Opener by Mark Repp

If you have a LiftMaster Screw Drive Garage Door Opener, check the clutch first. There are good replacement videos on youtube. If you don't want to take it apart to check the connection, use the video from your phone with the flashlight on. You can see it to see if it's broken without having to remove the device until you order it and it's delivered. To recalibrate the door, I found a socket that fits snugly into one end of the coupler. I used my impact drill to get the worm gear into the center of the bottom bracket. I then used the same setup to center the wire in the limit sensors (you need to remove the metal case to see the limit sensor. I tightened both stops, then moved the door back and forth, expanding the limits until they were correct were. .