If you like me had an iPod mini and got the dock for it left over, and now bought a iPod nano and quite frankly think that $29.00 is overkill for a dock this is for you.
Is it hard?
It's quite easy, the hardest part is to re-shape the shell of the dock to accommodate the adapter and all that needs is a dremel, sandpaper, a file and some time.
iPod Mini Dock
iPod Nano Universal Dock Adapter (comes with the iPod nano)
Dremel or saw
Gluegun or other good glue
Less than 30 mins
Step 1: Opening the iPod mini dock
The white upper part is kept in place with teeth on all 4 sides, you need to gently pry the white plastic outwards to free it from the grooves, something flat and hard is ideal, dont pry too hard or you will hurt the plastic.
Step 2: Mockup of the parts
Time to mockup the parts, all parts needed in the project already fit nicely together, except the white shell, we will get to that later.
First get the ipod mini dock's "guts" (picture 1), add the iPod nano universal dock adapter (picture 2) and place so the hole in the adapter sits around the dock connector of the guts, your result should look like picture 3. Make sure to orient the adapter correctly, add your nano and make sure it all fits (picture 4), if the dock is in working order the nano will make a sound when connected to it, even if the dock isn't plugged in into something.
You could use the dock in this state, but having the guts visible doesn't appeal to some people (including me).