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.
Did you try applying and holding torque across the connection then tapping on the join with a rubber mallet?
You are more likely to get injured when you are rigging up compared to when you are sailing.
Just think about it every time you go for a sail you get that little bit better !
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 that is into Windsurfing.
If it truly matters to you which way your rig lays when you thread your down haul you have bigger problems than threading your down haul.
Select to expand quoteMaddog49 said..
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!
Select to expand quoteBrien said..
If it truly matters to you which way your rig lays lies when you thread your down haul you have bigger problems than threading your down haul.
Yes, I know I have problems.
Select to expand quoteNotWal said...Brien said..
If it truly matters to you which way your rig lays lies when you thread your down haul you have bigger problems than threading your down haul.
Yes, I know I have problems.
Thanks for the correction, it was quite appropriate given the topic.
Always where a Lid when out sailing on your lonesome & some sort of bouensey vest.
