Just match the angle that's on them now...but you can't sharpen far enough back towards the pivot because the other blade is in the way. To properly sharpen the Micra scissors you have to remove at least one of the handles so you can open the scissors fully, a process I found sufficiently difficult that after I did it once, I sent further dull Micras back to Leatherman. They no doubt have a jig to hold all the bits and the springs in place while the pivot pin gets put back in.