The part that attaches to the support is slightly bent. The more you adjust one or the other, the more it retracts, allowing you to adjust the vertical adjustment of the mast they are attached to. My mast was tilted slightly to the left, and by tightening the bottom bracket bolts I was able to pull the mast into a vertical, upright position. The screws supplied with the bracket have a low tensile strength. Be careful not to overtighten the screws or they may snap off. I did not use the screws that came with the bracket, but instead used carriage bolts to attach the bracket to the reinforced front panel of the house.
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