Well I finally got two from ebay, but they were "too hot"....so I had to modify it a little... Firstly I took of the dial used to set the thermostat. Then I looked at the workings of it. I noted the little hexagonal bolt half way down the copper peace. This little bolt goes right through and touches a bar which goes onto the thermostat disk underneath. Here you can see the white bar. Turning the bolt 3/4 of a turn has the thermostat set between 36degC and 38degC. Perfect. Now back to seting humidity.