Comments below:

"Jeffrey P. Vasquez" wrote in
message . 17...

Larry W4CSC wrote:
Does it look like a little silver bullet with axial leads and one end
is plugged with a white ceramic something?

No, it looks like a light aluminum housing seated on a plastic plug with
two leads coming out. The aluminum case is open on top and there a metal
plate floating around inside the open top. If depressed it's kind of like
a
clicker, i.e. it's convex to the opening. Any idea?

Sounds like a device known as a "klicks-on" thermal limit switch. Similar
items are used in larger electric duct heaters in building HVAC systems. If
all else fails take it to a HVAC wholesaler and see if they can get you
something similar. Or a larger HVAC repair shop and see if they have an old
one lying around. They have different temperature ratings and either reset
automatically as they cool or have a button to reset them manually. The
little disk is bi-metal and bends as temperature increases, eventually
snapping across and opening a switch inside.