Many thanks both to Trevor and McCreed. Nice to know that the pots are still salvageable - thought I may have 'killed' them with so much re-soldering. Will give the clean-up a go, and try again. I'll have a look at Jaycar although I'm not sure how to test; what would I be looking for when testing? Do the pots, switch etc have standards regarding output? Presumably I would plug in my lead and test each component as well as joints? I did make myself a template before this series of re-soldering and yes it helps, however regarding the method of soldering - I'm aware of the theory but have rarely achieved it in practice (ie I almost always have to touch the solder itself which lead me to believe I needed the 40W in case the 25W was too low in power). Onward and upward!!