Good question, my reference has been the number of grooves in the load block screw from the open end of the screw to the load block lock nut. For me, for the CMD kit, it's 10 screw grooves. I use a pointy object or screwdriver to count the screw grooves.6-2 thanks for the instructions. I will give it a try. Just out of curiosity, how many turns do you need to keep the load block out on a full load?