Originally posted by GChilders
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that soldering pump is in fact a de-soldering pump. It contains a cylinder with a piston sliding internally. You load a spring being connected to teh piston and if you fire it it generates a vacuum in order to swallow soldering tin you want to get rid of.
It is a great help if you accidently soldered a bridge between two solder points. Heat the area up to melting tin and fire the preloaded pump. It will suck in much of the excess solder and you got rid of the short.
Another use of the pump is to desolder components. Once again melt the tin, retract soldering iron and imediately

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