Here’s a great video of a contra dance: YouTube – Arizona Contra Dance 2006 May Madness.
It shows Albuquerque caller Merri Rudd and the band The Privy Trippers. The dance is The Devil’s Backbone by William Watson.
MWSD Note: If you watch the dancing, you’ll see that part of the dance includes the “exchange” part of Spin Chain and Exchange the Gears. See Colin Hume’s article, Dance Technique:Enjoy Dancing Better, where he notes that that move appears in other Scottish dances as well.