Im making my first knives using files and hand sanding following bladsmiths tutorial. Things are going great so far (all credit to the great tutorial) but one of the things i would like to get better at is creating a clean well sanded plunge line. What im currently doing is clamping a piece of wood to the blade to use as a guide when creating the plunge line. this works well but if i leave the guide in place when i sand i am unable to sand all the way down into (and on the exposed edge of ) the plunge line. If i move the guide back slightly (or remove it completely) in order to get into the crevace i end up rounding off the sharp angle of the plunge. Any advice on how i can improve this area of my work is much appreciated.