I've currently got the opposite problem - I can't get my Lifeline QR to release! Collar seems to move OK and I've tugged on the wheel as hard as I dare but it just won't budge!
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Next, I'll remove the mounting bolts and try again - but I don't think that's the problem as I never had any problems removing the wheel before.
Any suggestions that don't include the use of a blowtorch will be welcomed!

Andy