Rabbit, you are right about the barrel holding situation. It should be a piece of cake to design some bracket to hold and rotate the barrels, eliminating the need for a helper. However, I measured a pair of second tier English game guns at an auction using a friend for a helper. He had never seen a Manson gauge before and had no trouble holding the barrels to the table for the ten minute procedure. As far as finding and maintaining "zero", the Manson, used horizontally with the eye hook, is as reliable as the Galazan table gauge or the Hosford.