On Mon, 13 Sep 2004 14:49:43 +0100, Stefek Zaba
wrote:

Presumably M3.5 was the closest in
diameter in metric sizes to the Imperial size previously used (4 BA?)

Curiously, BA sizes are in fact metric ! 4BA is 3.6mm diameter with a
slightly larger pitch than M3.5. I've found you can use M3.5 bolts in old
sockets, but not (obviously) the other way round. Perhaps this explains the
odd choice of size.

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