When I'm doing a speedo I use the biggest iron I have and the trick is to be quick. A small iron will cool down too quick and just heat up the speedo. The thick wires make it harder too as they take away heat quickly and suck up all the solder. I don't find it that easy so you're not alone, but a big iron and nice clean joints with fresh solder will make it easier.
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Mark Dyson
Clown
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