I've just been given this pocket watch to take apart, simple to find out how. When I got the back off I was amazed at the condition. Over 70 years (?) and it appears mint. Virtually untouched, it actually looks better than in the images, which seem to indicate slight damage to a few screws that is not visible normally. Strictly against advice, I wound it up and it lost 30 seconds in a 24 hour period. I shall now either take it apart or have it professionally serviced. Quality kit!
Maybe he should find a cheap Unitas movement like the 6498, or an equivalent ETA movement to experiment with. Basically the same, but it won't matter so much if his experimenting isn't successful. http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&&2uswk&Unitas_6498_1
There are many watches out there in poor condition for this (bet you could find several on ebay in a heartbeat)...that pocketwatch is actually quite fine.
Thanks for that. I downloaded the attached which gave me an idea. Although I did not know if the wrist watch and the pocket watch had the same criteria. Maybe I'll look for a broken watch to start with. It does seem a shame to risk this, I imagine parts could be a problem.