Memory wire is used for making jewellery. My partner makes up bracelets and other bits of beaded ornaments with the stuff. It is available in many different gauges so probably ideal for making springs And click wires. Try a beading and jewellery supplier or send me an email. Happy to raid her cave for a bit and send it along to you.

: I seen a topic on this before for making the click spring for the
: divers. Never did it but looked simple. Either Stewart or Jeff
: were the one showing instructions on it... I don't recall well.