What about pouring hot water on the outside. That will heat up the outside part quickly causing expansion whilst the inside being a separate piece will not expand as quickly. If you're very fast with it it may work. You'd need friends on either end with a boom attached and they start twisting as soon as you start pouring as the inside bit will expand too... just a little slower than the outside.
Tip 1 Don't go sailing on Valentines day and expect a warm welcome when you arrive home at 7.30pm oops Tip 2 Marry a girl bloke that is into Windsurfing.
Nan..just joking, mines pretty good..although he'd be better if he was into windsurfing!