The little ratcheting pawl that engages that gear has need of some lube. Would be nice if there was a little hole where you could insert a spray lube tube in and dowse that thing when this happens.
I know it's not working now, but I doubt it is more than this. Just a pain to deal with. A few raps of a hammer in the middle of the gear would probably get it to latch again... until next the next time you push the button.
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