I do not have any good photos of the turn signal mechanism, however, there are many great "exploded-view" illustrations in the 1963 Chevrolet Truck Shop Manual (covers 1960-1963) and the 1960-1966 Chev/GMC Truck Assembly Manual, showing the turn signal mechanism. I recommend these books for anyone who owns a '60-'66 Chevy Truck. They are available at:

www.lmctruck.com
www.classicparts.com
www.bowtiebits.com
www.oldchevytrucks.com

among others. Good luck with your project and I hope this information is helpful.