As boxer noted, you can decrease the trimmed length by finely trimming the rod. If you need to increase the length, spread the split shank of the cutter ever so slightly with a slotted screwdriver blade and then set the trim length with a caliper. You will need to thread the cutter in with pliers so take care to pad the cutter or tool. I use bowstring nock plier, works like a champ.
I also have a couple of cartridges that have special length needs. I just ordered a cutter from Lee
for the appropriate length.