On Aug 10, 12:19*pm, Dave__67 wrote:
On Aug 10, 11:55*am, spaco wrote:

I seem to remember that, during wwII, the guys at some eastern US air
force base found that they could solder a penny or a nickel into the
center of a spark plug compression washer and then use it in a vending
machine. *The idea worked so well that it created a major problem for
vending machine makers and operators of the day.

* Does anyone remember more details?

Pete Stanaitis

Not that tidbit, but interesting:http://books.google.com/books?id=OyE...pg=PA66&dq=wwI...

It could be the non-steel insert was required to get past the
electrical resistance testing magnets.

Dave

It is in that article, where it continues on page 204.

Link again as a short link-

http://bit.ly/cDHv7b

Dave