When I retract the slide all the way it seems to bind and get stuck. When I want to put the slide back out I push the button and it just makes a clicking sound and it wont go back out. There is a 3/4" nut at the opposite side of the slide for manual operation. If I turn that 3/4" nut a half turn it seems to loosen up the slide and then the motor will push it out. Does anyone have any idea what could be causing this.