Red hot, carbs, petrol, fumes - WOOF!bash wrote:get a piece of metal thats the same diameter as the outer screw hole and then warm said metal up with a blow torch or gas ring away from the car until it gets red then place it in the hole so that the heat transfers into the aluminium tower then try the screwdriver again but tighten first then try to unscrew it.
This method also works on seized brake nipples using an old socket to get red hot.
Bash
PS Keep an extiguisher handy, you shoudnt need it doing it this way but you never know.
(might try the opposite approach first).