Should you break a propeller shaft, splice it the same as you would a broken arm by placing four pieces of iron round (sic) the sides and wrapping tightly with a piece of wire. Fasten a piece of wire from the front universal joint to the back universal joint, wrapping it in the opposite direction from the way the propeller shaft turns. You will find that both pieces must go together.

 Found on the Horseless Carriage Web Page
http://www.hcca.org/