Help,I am trying to take apart the window frame in my 29 Tudor. It is off the car and has no glass. I am needing to chop the frame 5". I cant Budge the 3screws on each top side of the frame. I've used penatrating oil and several other things but nothing has worked. The flat screwdriver heads are about history! I know i'm not the only one that has or had this problem. What do you suggest? Mike