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My last one and I just can't see it...
28d tools not so powerful for cutting stone up (8)
?W?A?E?S

tweakers?

weaker in STone upwards?

Are they tools?

yes a tweaker is a small screwdriver

Thank you both. I cannot find tweaker in Chambers 12th, but it looks good anyway :)

http://dictionary.reference.com/browse/tweaker?qsrc=2446

http://dictionary.reference.com/browse/tweaker

found it here

crossed in the post ;)

As a former electrical/electronics engineer in a steelworks, we used to use these all the time although we tended to call them sixpenny or tanner screwdrivers.

I rarely remember them being called tweakers, commonly or otherwise.