I think you'd have a job to knacker a nut with one of them spanners - I think they were made of a slightly metalic soft cheese if I recall correctly.
I got a puncture on my motor bike on the M6 very late one night. Managed to put it in gear and walk beside it for a mile up the hill to Keele Services where a friendly young chap in the garage (they used to have garages) helped me remove the tyre and fit a spare inner tube. He then proceeded to set about my tyre enthusiastically with a very large tyre lever of the type used on lorry wheels. The tyre refused to pump up so we took the tube out and found.... SEVEN punctures made by the tyre lever.