Thanks, one of the biggest problems is that most of the screws have been driven right down under the surface, the heads aren't even visible and are blocked by splinters of deck, so I'm working blind. I will try all the tips you have given and hopefully I'll get on a bit better!Fair enough if a No.3 won't fit it's got to be a No.2, in the photo it dose look like a No.3 though.
My top tip is to use a small pick, or very small flat screwey to remove the crud out of the head before trying to un-screw them, as the crud in the bottom of the recess prevents the bit engaging properly, this makes a big difference
one of the biggest problems is that most of the screws have been driven right down under the surface, the heads aren't even visible and are blocked by splinters of deck
Well tonight i screwed down 10m2 of backerboard to my kitchen floor ready for tiling, gave the dewalts a go and used my dw827 impact as well and got through 2 bits per board (x10 boards), finished off just firing screws in everywhere just to finish the bag off and used 1 gold wera bit
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