Tek,
That is a gorgeous piece. [Sorry, Chicken. Yours is kind of ugly.] People still seem to offer them (CG and Teck 1) on ebay, in various stages of abuse. My assumption is that any broken or missing part or screw would have to be custom machined. With one as fine as yours, I would still be worried about maintaining the cutting edges. How well does yours perform?
Most of the ebay "tobacco cutters" are guillotine style plug cutters, and not really suited to shredding. Yours is a rare find.
Bob