> The 474 excells are removing leaded components and has enough heat
> capacity to desolder large component leads (as on large electrolytic
> capacitors) from holes embedded in large copper planes.  The tricks
> are to use the right temperature setting, keep all the filters clear
> (replace regularly), empty the solder reservoir regularly, and to use
> a nozzle with the right hole size.  I have adapted a number of smaller
> nozzles by drilling them out so I can better deal with larger leads

This advice is as relevant to the Weller units as well, that I mentioned
previously.
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