Complicated. I have one I've made up that one you get the blade positioned, you don't remove it until both sides are finished down to say that Norton 16 grit. I'm soory I still don't post pictures to the forums. When I did get pictures up a lot of viewers thought it was too simple to work very well at all. I do all sorts off blade shapes. If you want to see my folders that all have been done with my simple set up, go to the customknifegallery.com and scroll down on the left hand side.
Basically my sytem places the blade between two pieces of micarta each about 1" thick and a tilting table. Yes I grind double blades with this as well without taking the blade out of the two micarta blocks. Frank