TechNetters, in 7711, method 3.6.3, Gull Wing Removal (two-sided) - Flux
application method, step 5 says "Remove old solder from tip and thermal
shock tip with damp sponge".  Other rework methods say the same thing -
thermal shock tip.  Can someone explain why the thermal shock is necessary
or useful?  Removing old solder seems like a good idea, and seems to entail
thermal shock on the sponge as well.  Any comments would be appreciated.
 Lou Hart

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