WindySimon said...
Only other thing i would try is to block off the top of the mast and put a hose into the bottom sealed with a rag... give it full pressure and try to wiggle the joint with the water pressure in there in the hope that you may promote a leak... not sure if that would work never had to do that... i just use the hot water trick thing... make sure that you dont heat the lower mast tho as you need it as cold as you can get it... Also dont pour water over it for too long coz it will heat thru to the inner pipe too...
This way worked for me, except that I took the bung out of the top and put the water in there. Depends which way around your ferrule is I guess - you want to put water into the end that isn't attached to the ferrule (so top for most masts, bottom for Ezzy/Powerex skinnies).
Water pressure is relentless, once you start shaking the mast with the tap on full you'll see it start to come apart.