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My guess is with an iron. The irons I am thinking of look like a big electrical circuit soldering iron with a little triangular iron at the end. I guess there is not enough heat inside to pose a problem and the swipe of the iron is quick enough that it cools pretty quickly. These would be similar to a lead iron used to do bodywork on old cars.
Exactly, Huvious - both lid and box would previously be 'tinned' with a row of solder. The bulbous copper tip of the iron would instantly melt the solder on lid to the box, with barely any heat transfer inside.
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