Dave> It must be quite a fine line making a posidrive that's hard Dave> enough to last, but not so hard it shatters. I've got Dave> several that have 'rounded off' just slightly, but enough to Dave> make them near useless. At least you can regrind them to be Dave> a paint tin opener...
Apart from a couple of small ones, I have about 5 hex drive handles and multiple assortments of bits. When one rounds off, I just throw it. Replacement heads are pennies, and the cheaper (softer) ones often round the screw-head less.
There are two alternatives I've seen discussed - one is a posidrive (or perhaps phillips) bit with some ridges which help to stop it sliding out of the screw, and the other is to use torx headed screws.
AndyC
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+-------------------------------------------------------------------------+ |Andy Cunningham aka AndyC the WB | andy -at- cunningham.me.uk |
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