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brought next idea :
I see these in the Screwfix catalogue, Impact Drivers. Anyone know what
that is? Does the drill hammer? Is it just a drill/driver without a
chuck? What is the advantage? Also, Drywall Drivers, also in Screwfix,
what do they do over a drill/driver? If a tool can save me time, effort
and produces a better quality job, then I am always interested.

It is a screwdriver for tightening and loosening extremely tight
screws, often used in engineering and mechanical trades. They usually
take the form of a holder with interchangable bits for different screw
types/sizes. They are designed to be hit with a hammer, when a short
spiral imparts a sharp turning force upon the screw.

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Regards,
Harry (M1BYT) (L)
http://www.ukradioamateur.co.uk