For the large Andersons what I do is this.

1/ Gently tighten the plated copper connector in the vice with the cable socket pointing upwards with the thin bit in the jaws and the cable socket part as far from the jaws as possible to reduce the chances of the vice being a heat sink.
2/ With some plumbers flux in the bottom of the cable socket I then fill about 2/3 with short sticks of pipe solder.
3/ strip the cable end to the correct length and apply a little flux to the cable conductor.
4/ Gently heat the cable socket with the heat of the blowtorch, it is not hard to see when all the solder is melted.
5/ Slowly and carefully put the prepared cable end into the molten solder you may have to apply a little heat at the same time.
NOTE molten metal even solder is not good stuff to drink or use as skin cream so BE SAFE! gloves goggles etc.
6/ Remove the heat and hold the joint together until you are sure the solder is set. lay aside to cool off. or you will burn yourself.
Job done