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It sounds as though you are still making some good progress Crueby, and I have no doubt you will track down those last few pesky leaks and get them fixed.Bill
Have you guys seen Ed Hume's Shay construction? https://www.flickr.com/photos/edhume3/sets/72157614192042835Stunning!Simon
... that's why you bring up the pressure in stages and relax it before going for the two time swp.
It is a fact that a boiler will hold steam but leak water when coldStuart