Aargh! Yesterday I made a real mess of a screw trying to remove it because I didn't realise it was left hand threaded. One of those times when a manual would have been really useful. Does anyone have a 2 BA left hand threaded machine screw, or know of a source? The original is tin plated brass with a cheese head and 7/16" long, but these details aren't critical. Let me know if you do!