"The Enfield inch" when an inch is not an inch!

[Peter Laidler]

There is also another imperial measurement used in the large workshops in the Army. 'A gnats knacker'. As in '.....ere......, skim a gnats knacker of the edge of this will you?' We had another to describe a fit that was a bit sloppy too '........ like throwing a sausage down the high street'. Has anyone encountered centinches yet?