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Bought but didn't use the mechanical flange on my two tanks. Just silicone and cut a hole a fraction small and wind in the heater using its thread to cut in.No leaks whatsoever.
Have you guys used the essex flange or mechanical flange to attach your heating element to your tank,i have a 500 l upright tank
sounds simple and probably dull but couldnt you just use the flange here http://www.toolstation.com/shop/Heating/Central%20Heating/Immersion%20Heater%20Flange/d230/sd2708/p31429 as a back nut and some PTFE tape?