Jeff on post number 2 here Aaaaargh! Why did I join this forum? intimated that the control knob on my Vapalux 300X can be difficult to remove, and he ain't kidding. I have used penetrating fluid, clamped the spindle in my vice (aluminium jaws) and used pliers on the knob cushioned with leather, but wilt it heck unscrew. Anyone found a solution?