While mowing, I came across a plum trunk, which resulted in the knife bending and it needs to be unscrewed. The impact was so strong that the aluminum clutch went off, it probably caused the tightening of the knife mounting screw and a dozen degrees and now I can't unscrew it for anything. Would heating or cooling it do anything? normally I broke the key when unscrewing and the screw will not budge, good thing it is metal, of good quality, for a 17mm wrench and the head is still healthy. Of course, I lubricated with petroleum, oil, penetrol, but the screw will not budge, what to do?
