Poor crank design for an excellent array system. The crank is not easy to turn when adjusting array angle closer to horizontal as opposed to vertical. The links at the pivot point are twisting to the point where they will shear. I would recommend that MT Solar add some grease fittings to the crank mechanism and the main 4" diameter tube that changes array angle.
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We are aware of this issue and have been working on improvements on our screw adjuster/crank. If the customer would like to contact us directly, we'd be happy to work with them and send out a replacement screw adjuster/crank.