Here are some pics.
#1 is the parts. #1 is the handle to turn the cutter head. #2 is the Pilot. #3 is the cutter head. #4 is the frame. The knurled knob on the bottom is for the coarse adjustment.
#2 is parts 1,2,3 put together.
#3 shows the hole the cutter goers into.
#4 shows the knob the primer pocket sets over.
#5 shows the fine adjustment nut.
#6 shows with the case in place as you would when trimming.
Holding everything in place by hand to trim is possible but much easier if once adjusted you mout the frame in a vise. This way you only have to hold the case.
Leo