Using the WM-200 angle thingamajig to set the bevel angle is the WRONG way to sharpen knives on the Tormek. It's well suited to setting angles on things like planar blades and chisels, but it's terrible for knives. The best way to set the angle is to use software and a vernier caliper. In the software, you set the desired sharpening angle, the diameter of the wheel, and the projection distance, which is the distance between the stop on the clamp and the apex of the edge. Through the magic of math, the software then spits out the exact height you need to set the universal support bar (USB) in order to achieve your desired angle. You then set that height on your caliper and use it to set the height of the USB.
I know it sounds wildly convoluted and time consuming, but once you get the hang of it, it only takes about minute, which is at least as quick as using the WM-200 or the Sharpie trick, and it's a heckuva lot more accurate.