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Yes, left handed thread screws do exist, as stated most commonly for on rotating equipment.
I can remember building a air raid type rotating siren that just HAD to have them on, in the right place.
Otherwise a big red disc was going to fly through the wall and into the next county.
Why is it that you can borrow a librray book that has not been taken out for the past 3 years, no-one else wants and if your a day over the return date, you get fined for it?
Why is it that women get on a bus, then search through thier handbag for thier purse and then search out for the change to pay thier fare? (Oh hang on, although still one of lifes great mysteries, this one is heading towards the anti woman thread.)
Why is it that the postman can always deliver unwanted SPAM mail, almost every day yet when your expecting a letter it never arrives?
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