use a hot as poss soldering iron with a large tip.
I use a gas dremel ion and a decent medium tip. heats up in 30 seconds.
tin both items to be soldered, put the wire onto the pole and heat the pair and do that for the minimum to make them bind.
decent solder is a must and dont over solder as thets messy and also, dont under heat as can become a dry joint and break off easily.
practice with a few odd bis of wire till you get it right and then crack on....
Dont heat any electric parts, esc/motor etc to long as can cause damage.
and defo dont use to much solder as can drip where its not needed.......
