On Genies "clutchless" openers, there is a small plastic coupler that connects the screw assembly to the main power head. To inspect and replace that part, remove the two screws holding the rail to the main power head. Slide the rail away from the main power head. The coupler may still be attached to the motor shaft. Remove the coupler with a pair of needle nose pliers and inspect both sides of the coupler. Note: If the screw assembly on your Genie garage door opener protrudes out the back end of the main power head, you do not have a "clutchless" opener, and there is no coupler on that opener.
