> Can't you just use a high-temp hot air gun?!

Possibly, but I don't got one (it died) to try that out

The technician friends use the little butane pencil torches, which
must concentrate the heat in a small area in a short time. I know
that one of the things they do is to put revised OTPs or chipsets
in telcom equipment. With quite a number of boards to do they
get plenty of practice

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