Originally Posted by
shagino
Thanks. I can't find the 4mm so it'll probably be the 5mm. The guys at the LHS said that with the wire I'm using, I need to go between 750-850*.
The cooling in the connector isn't intentional. Getting the wire while the iron is still touching the connector is the tricky part

More heat... the battle cry of those who can't solder.
Get a little clamp to help hold the parts, and do not fill the cup of the connector with solder first, tin the wire, and put it in the empty solder cup of the connector, then apply heat and solder.
Once you learn the technique and practice a little, its much easier than pre-filling the connector.