I was told by fish and game years ago to put the gauge on the head just short of the eyes and slide the gauge up till it drops in between the eyes and then towards the back. Reason being there is a meaty part of the flesh there in between the eyes. If you come in from the front you will catch the section of meaty flesh and it will make a just barely legal bug short. Just my 2 cents! I also take a few good swipes with a file to my gauge. Never had a problem!