Where can I buy the CW® Rotary Gear Hinge Assembly as show in the link below (part # 1, with out the glass)? I have a similar assembly, but the glass keeps coming out of the hinge. My showere assembly is old and the worn and the hings looks like a good replacement.

http://www.cwdoor.com/PDF/Instructions/5400H_7000H.pdf

Cw shower door header, model 2400