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The screen screw spins and will not tighten
The shower screen screw spins and will not tighten
A Home-Barista owner whose screw would not tighten after 8 years found metallic debris in the threads. Clean the threads and try the screw without the screen. If it still spins, try a new screw (SP0001476); a damaged thread in the group is service-centre work.
A retailer warns not to force the key: the screw can shear.