Keith, I agree with Terry about checking the direction of rotation. The official, and very detailed Airstream manual that came with my Excella gives the procedure with the wrong direction of rotation! I sorted it out by removing the wheel and drum and watching the adjuster in action. If I recall correctly, I dig the bent screwdriver blade in at the bottom of the wheel and lever the wheel upwards to tighten. You need to check it out on your trailer. Good luck. Nick.
Nick Crowhurst, Excella 25 1988, Dodge Ram 2500 Cummins Diesel. England in summer, USA in winter.
"The price of freedom is eternal maintenance."