I can't believe I have to ask what should be obvious, but where is the collet tightening screw/port/knob located? Also, the 3/8-28 threaded hole that is being pointed at, what is it's purpose? I saw several of these units pictured on Ebay and the threaded hole is empty on all of them.
Keep turning the brass pulley until a M6 grub screw appears through that hole, or through another seemingly blank hole. Put in the stem and do half turns until it grips the stem securely. Do not over tighten!!!
I acquired several manual 3R hydraulic chucks with a used edm and some seem unable to tighten when the allen screw is turned. How do you refill the system and with what fluid? These are very basic, simple 20mm 3R chucks.
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