Yup a very nice demonstration. To answer your questions,

- 100W+ soldering iron with a big flat surface, leave it to heat up for a good few minutes and allow it to reheat for a minute between cells
- I didn't bother with balancing wires, didn't need them
- I used a dapter with my nicad charger, do a search on google and you will find them but as I said this method won't balance the cells, merely trick your current charger into thinking its charging nicads.
- Ebay had a supplier selling them for a while. The cells were removed from battery packs and not all of the same voltage so a bit of balancing was required but nothing major.

If you are going to use a balancer then place one wire on the positive end of each cell, or on the bar and one on the negative of the whole pack.