Hello fellow silver traditionalists!! I recently picked up a plethora of dkrm stuff and included was this beseler head, the seperate fan and hose....and this diffusion disc that had come loose. A few questions.... What head is this? For VC printing, mostly short exposures, is the cooling fan neccesary? This diffiusion disc...Where does it go? Is it part of this head? Many thanks and am so glad to have found this group.