All sorts of good news from Rob Ives today - first, his paper Ratchet mechanism has been updated (Mk II), those who already have the original model can just re-download and you've got it.
Ratchet Mechanism Papercraft
Crank Mechanism Papercraft
Second, is the release of the Crank Mechanism (crankshaft) - it shows you how cranks work and how you could incorporate it to your own designs.
I saved the best for last, Paperkraft.net readers get 25% at the Rob Ives Store until the end of the year - just use the code PAPERKRAFT25 on checkout and enjoy the savings.
2010 Santa Claus Papercraft and Reindeer Set [Related Papercraft Articles]
2010 Mini Christmas Tree Papercrafts and Christmas String Decorations
2010 Christmas Tree Ornament Papercrafts
Happy Christmas Tree Papercraft