On Sun, 8 Nov 2009 08:42:26 -0000, "N_Cook" wrote:

As used in thermal switches. Instead of in form of a bimetal strip and
continuous curving with temperature, these are 0.5 inch diameter and
make a definite flip from concave to convex at a specific temperature.
About 1mm of abrupt movement gives a very positive transition for the
switch contacts. Would it be possible to change the characteristic
temperature by grinding back a spot/ring/radii? on one face? which
face? or would it just destroy the action/activation force?

I belive "Clixon" in the UK make these.

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Best Regards:
Baron.