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Many thanks Fahim, that was a good bit of googling - a lot more than I found. All bookmarked for future reference.
Because I've already got that super-duper temperature-difference device, I'll stick with finger-powered on-off-ing for the moment with the Bintel heater I've ordered.
If you don't hear from me again on this subject, it's because manual switching was a dismal failure and I'm hard at work with the soldering iron!
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