Yes protrusion is at 75mm. The guide on the svd 185 needs to be reversed? It is the guide on the 185 that's stopping me to get closer when it is sliding on the tool rest. The tool rest is in the lower position grind stone going away from tool. When tool handle goes left the sharping end starts at approx. 3/4 from edge of grind stone to continuing the sharping tip leaves the grind stone. At approx. 45% the handle i should stop but the wing is not sharpened complete. Doing something wrong??