OK, what I posted was only criticism, but not very constructive. Let me rectify that...
It is very clearly evident that he heated the solder with his iron and applied it to the back of the pot. The back of the pot being cold to start with, cooled the solder "upon impact" and caused it to blob up and reduced the integrity of the wire-to-pot connection. The correct way would be to heat the back of the pot with your iron and let the solder flow onto it. If you've done it correctly, the finished product will look like you put a drop of silver-colored water on it. Very thin and showing the contour of the wire underneath. But it WON'T look like a blob with lots of rosin flux surrounding it and hiding the wire. You DON'T need much solder. "More" is not always "better".
I'm sure any of you who do soldering can learn this technique...it's really not as hard as some of you think. Next time you've got your iron out, try doing it both ways and see the difference (assuming you have a decent iron preferably 60 watts or greater).
Yes, it CAN be done with a 40 watt iron, but it takes more time and skill and can cause damage if you're not careful. Yes, a lower watt iron can cause more damage to the pot than a VERY hot iron.