In article .com,
Andy Dingley wrote:
Actually the first incarnation of this type of device was designed for car
use - to allow easy wheel nut loosening in event of a puncture,

The _first_ incarnation was used on-site in the 1920s with early pre-
stressed concrete work. You could tighten these things up with a
couple of hefty Mohawks and a long spanner, but even they couldn't
undo them from the straining framework afterwards to put the stress
into the concrete.

Ah - right. Perhaps I should have said the first DIY incarnation. ;-)

--
*What was the best thing before sliced bread? *

Dave Plowman London SW
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