By the way, I answered quixmac's question via private message. Here was my response:
Sent: Wed Nov 16, 2011 7:50 am
I usually *slowly* and *carefully* peel the valve off the bladder without problems. My friend says you can use a hair dryer, but be careful to heat it up too much.
As far as the fix, I'm confident enough in my *own* work to call it permanent. I have fixed over 15 valves and none have leaked afterwards.
Oh, and after you apply the glue, be sure to use a card and scrape around the inside and outside edges of the valve base to remove excess glue.
I hope that helps, and if you have any other questions, let me know.