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Hey Snoc you sound like Tedd Bullpitt, you forgot to add on to the end"and I'm king of the castle". I will tell  you now, i would be very surprised if anything my mate Jack said was too far off the mark. It is possible for a metal surface to appear quite clean and shiny but in fact be be pitted with microscopic highs and lows which make it quite resistive to anything sliding along it. I think it is to do with coefficient of depth of molecular penetration and surface tension; which is of course as we all know is very much affected by temperature and humiidty. Rgds Ian
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