US Patent 10961756 Shower door system having anti-torque back plate device

An anti-lift tab of a roller assembly that rides along a fixed rail in use. The anti-lift tab protrudes from the bottom of a face plate having keys molded onto the back face of the face plate which interface with keyways of a castellated nut and shaft component having internal screw threads. A threaded rod is inserted through a bearing seated in the roller assembly. The rod is screwed into the castellated nut and shaft component. A screw attaches the face plate to the castellated nut shaft component and to the roller assembly.