Care to show us a picture of the Dremel setup to trim brass?a dremel tool or a nice dremel tool and a jig , not really a gun related item so you could pick one up pretty cheap and it does a lot of other things with an almost unlimited amount of attachments at least that was my plan .
vrsIt's a drill press, tool holder and flex shaft holder all in one. Drill accurate perpendicular and angled holes. Holds your tool in place for applications like sanding and buffing, and the telescoping flex shaft holder extends to any height between 16 anwww.toolnut.com
GEN 3 CASE TRIMMER 399. and out of stock and shipping
good luck which or what ever you get .