That was one of two failures on my Birdy, the the screw that that little plastic catch catches on (try saying that when you've had a few 'sherbets'!) pulled out of the frame, the other failure was the handle bars snapping off in my hands as I rode (luckily) uphill. 5 mins later I would have been doing 40 mph downhill! Yikes! Birdy sent a replacement to Avon Valley Cyclery in Bath and it was fixed free of charge.