Very nice pics exotickle and alf, thanks for sharing them. I love to see wrinkled soles and curled toes in tickling pics because that means the girl being tickled actually has ticklish feet and isn't faking it. As for your question alf I would say that the more sturdy set of stocks is made from 2x4's, 2x12's and 1x2's which are used to trim the stocks out as well as hold them in place. The second set of stocks is made of thick pegboard and they are held firm by a very detailed latch or locking mechanism.