Manson worked for Clymer. I think both gauges are the same. I prefer the rope over the finger, but either works just fine. I hung my Manson for years, but since learning of the horizontal method, I prefer it at home or away from home. Oscar was a friend and I appreciated his spring modification, but the horizontal method makes the spring unneccesary. I am not trying to convert anyone to my method, only want everyone to be aware of it.