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#4
10th July 2010, 04:29 PM
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if you use a thing called a proximity switch (rs online) you can switch of almost any metal part
i have seen theaes used on motorbike in disc bolts to run speedo come in loads of diffrent sizes and can be made real small sme are like a 1 inch m4 stud with a wire coming out thay do need a 6-24v dc supply but v low ampage  
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