I have some 12/2 Romex and #12 THHN lying around. I'll have to see if I can scrape up the spare time, do a few splices, photograph and post. Even #12s are pretty easy to splice -- it just takes patience, a pair of locking pliers (to hold things together initially) and a pair of lineman's pliers (to work the end of the wire).
Can you please do that with a 10awg stranded wire? Or does it only work with solid wire?