One of the reasons that the screws get buggered up is that they are very likely to be posidriv, not phillips. The posidriv is not as pointed as the phillips, so won't go into the slot as far, thus shredding the slot. If you can't get hold of a pozidriv screwdriver, a temporary fix is to grind a couple of centimeters off the end of a phillips screwdriver. Not perfect, but better than just using the phillips screwdriver as it is. I have a set of different types/sizes of screwdriver heads that fit into a handle, so that I can try each head in turn, until I find one that fits perfectly.
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By birth an Englishman, by the grace of God a Yorkshireman.
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