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I found some products that seem to be what you described. They use a temperature sensitive paraffin foam to actuate an arm that can be adjusted for the desired temperature. Thanks for the tip.

"It is not necessary to have hope in order to persevere."
by ARGeezer (ARGeezer a in a circle eurotrib daught com) on Sun Mar 11th, 2012 at 07:56:23 PM EST
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by njh on Sun Mar 11th, 2012 at 09:47:08 PM EST
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Thank you. I 'knew' something like that existed and it is available from a supplier in a neighboring state.

"It is not necessary to have hope in order to persevere."
by ARGeezer (ARGeezer a in a circle eurotrib daught com) on Mon Mar 12th, 2012 at 12:54:35 AM EST
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