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Originally Posted by spiral
So physical speaking, more weight than average & enough curve to the blade to put a sideways pull in rather than a straight linear pull is required? so that it pulls free? 
Or to my mind, if as sharp as a cut throat razor would work as well?  But would colour your fingers perhaps...
Spiral |
Salaams Spiral~ I have the distinct impression it is more to do with the square root of the wily grin on the customers face divided by the depth of his pocket !!
Regards,
Ibrahiim al Balooshi.