On Sun, 01 Jan 2006 13:18:04 +0000, Mike Laine wrote:

Just how do these things work?

I ended up with one on a jumper I bought. I took it to bits to see how
it worked (this must be an inherent trait of most people in this
group). As far as I could see, the pin was gripped by three ball
bearings which had to be moved outwards to release it.

The electronics bit is easy by comparison ;-)

--
Nigel M