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Hi, I am having trouble shooting water hammer I am hearing from one radiator. I have all of Dan's books but can't get this one. I have a one pipe steam system, main insulated except for the room in picture where it provides heat, pressure less than 2, mains have gorton 1's. The one inch pipe in the middle of the room goes towards the dining room and has water hammer near the location where the supply valve connects, very loud when the boiler fires multiple times such as the current cold weather we are having. Over 32 degrees, i don't hear it that much. Before I had a sag where the T connects to the main pipe. I strapped to try to level it. The banging sound became a little less because of it but it still happens. The radiator had a Gorton 5 that I changed to Gorton 4, instead of banging all the time, its only when its real cold outside. I have a White Rodgers thermostat but I can't control the cycles per hour on it. I know one per hour is ideal. Should I change the Gorton 4 to a Gorton 3 on the radiator? Should I change the thermostat? What do you guys think? It's only one radiator that has banging issues, i have a total of 9 radiators. As always, your help is appreciated. Thanks.