[bitrot]

I have replaced a DPDT coil cut/phase reversal switch on a guitar circuit in an old guitar. On the old switch, the common ground wire connects to one of the poles but was also soldered to the side of the switch before continuing on to another DPDT switch.

Currently, I have the 20 guage common ground wire bent in such a way that contact is made to the side of the switch, but I can't get the solder to stick to the outside of the switch.

While I have succesfully been soldering for the last 2 weeks, and have come up to speed on tinning, cleaning the tip etc with my brand new Hakko 936, I don't yet have any flux paste.

Will applying flux paste to the casing of the switch help the solder stick? I've already made sure the casing is clean (scrubbed a bit with sandpaper).

What's the common solution when you run into an alloy that simply won't adhere to solder, and which you don't want to overheat due to fear of damaging the internal components? Is Flux the answer?

Is there a kind of flux that is recommended for soldering to audio trim pot casings? (like would acid based be best for this scenario, whereas non-acid base types would be safer for boards).

Lastly, any recommendations on a good tip for larger soldering jobs such as this (like cables, etc), where large dollups of solder are required? Recommended shape and diameter?

I'm sure I'd be fine just getting a bigger tip based on the hakko site's recommendation, but knowing what people use and find practical would be helpful.

thanks