Have you tried lubricating it? If not, try some WD-40 or other penetrating oil.
Mike
-------------------------------------------------------------------------------------- 'What is it? A Maverick? No. A Pinto? No. Looks like a mini Camaro. A Camaro? No. A Chevette? HAHA, No. It's a Vega. Ahhhhh, cool man.'
Not sure what lubricant would be best to use. I think it is a plastic ring that goes against the metal roller. It retracts fine and catches as it should, just won't come out from the all the way down position.