I got my guide last week and was eager to get some dulled Magnus Stinger and Ser-Razor blades touched up. However, when I got it assembled, and knowing that it could take some playing around to get the blade touching the sand paper just right, I couldn't get it to actually touch the blade edge. All I can get to touch the paper is the side of the broad head blade, just where the blade angles down to the sharpened part. Any tricks of the trade that anyone can suggest?