Its an old Herters collet clamp case trimmer , it was Dad's , associated memories blah , blah , etc . It is a one piece , 1/2" by 5" HSS 4 tooth cutter D&T to take reamers or pilots .
I have the skills to eyeball and inch drill from about 3/16 up , I used to be able to do 1/8" not so much anymore .
I'm thinking a diamond file by hand I can pull it off , good enough for another 3-5,000 formed cases any way .
This is a want to thing , not a have to . I have a Pro Trim , a spare cutter for it ,19 pilots and 4-5 reamers .