Zip Trim Explained

Essentially, this tool is a mini-lathe.  Using the shell holder that comes with the appropriate case length gauge,  a deprimed case is mounted to this unit in the same way they are mounted to the lock stud that comes with the cutter.

With three pulls of the pull-string, you can trim the case and chamfer the inside and outside of the case neck.  What some consider to be a normally tedious process is reduced to mere seconds.  Some choose to use steel wool and polish the case with an additional pull or two.