I particularly liked your request ji gantor for boiler makers to notify of their tips. One of my boilermakers at work did some aluminium mig welding for me, I asked if he knew if the tip should be a size larger for the welding becasue of the expansion of aluminium and he said don't worry about it. I had to try not to laugh every time he was welding and the wire spooled up because it jammed due to the expansion of the metal. No offence meant to any boiler makers just pointing out that a good tradie is a good tradie regardless of which trade.