I recently came into the possession of an amazing beseler enlarger in what is essentially perfect condition minus the arm to open the film tray, a slight need for a tightening mechanism so i can swivel the head and secure it at 90degrees, and a cold light source. does anyone have any resources to where i can find these parts? from what the owner told me Zone VI is the way to go in terms of cold light sources but I'm unsure as to which head i need to my enlarger. If anyone has any input then please let me know!