I have several Jeff Tanner round ball moulds, which cast beautifully but have no sprue cutter/sprue plate. Ordinarily, I use an rail cutter (made to cut HO & N scale rail to a given length; Lambert imported it), but it's slow, tedious, and often takes several passes to make a smooth cut. Little while ago I tried rail cutting tool made by Xuron and found it was not only faster, but cut much more evenly than the Lambert tool or various flush cutting pliers I've tried. In short, it did a perfect job. Btw, Xuron advertises in
Railroad Model Craftsman and
Model Railroader magazines and does a great job in cutting rail too!