Heated Build Platform Levelling Corner Supports

My old MBI HBP died an ignoble death, groaning and grunting before letting out the magic blue smoke.

And as we all know, once you let out the magic blue smoke, you're cooked (literally... and then quite un-literally, unfortunately)

So I made my own HBP - but the insulation was uneven and resulted in a horribly crooked build platform with a nasty tendency to give more on one side than the other.

Very much inspired by: http://www.thingiverse.com/thing:3453 but to solve a slightly differen