For many fine solderings you need magnet wire.
-But, where to get it?
It's cheap and easy:
Open an 'electric motor'
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Step 1: If You Have Open the Motor...
...you will see an armeture.
Unwind the coils and you have the wire!
Step 2: But Now?
You must remove the insolution of the wire.
You can use sandpaper, burn it away or melt it down by soldering.
Melting is my favorite.
Step 3: The Finish Wire
Remove the wire from the soldering iron and you have uninsulated wire with a good contact.
Have fun with your wire! Good working!