iFixit

We're noticing a strong trend as we take apart this iPod: adhesive.

The click wheel is held in place by nothing but a very strong adhesive, which is going to make replacing it difficult. You'll have to get it to stay in place as well as Apple has (i.e. very well).

Here the battery is out of its metal housing, which is attached to the logic board by, that's right, adhesive.

The battery is attached to the logic board by three through-hole solder points, as in the second generation Nano (sorry, no easy replacements).

And here's everything together again, but apart.

A close-up of the logic board's top, which sports an eight gigabyte Samsung flash memory chip and headphone jack.

The headphone jack is soldered to the logic board, as in the first generation Nano, but not in the second.

A close-up of the logic board's bottom.