How to use:

Step 1 - cutting body post 
Here you have the option to use a body clip as guidance or use it to free cut.
 
Option 1 to cut 6mm above the insert body clip 

Option 2 to cut 10mm above the insert body clip

Option 3 to free cut when you don't use a body clip

If you select your size you you put your hobby knife with a 8-9mm high blade in the gap and insert a 1/8 ball in the hole. Then secure the knob.

Tighten down your knob and this will cut your body post.

Step 2 - camfering body post 

Insert the fresh cut body post in the chamfering hole. Slightly turn the tool and this will make the natural chamfered finish. Easy to mount your body and prevent damage on the body arround the body hole.