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What usually happens is that insufficient lubrication causes the pivots to seize up, and the weak point is the angled bracket that slides on the adjuster.
If you look carefully you can usually detect that it is not straight, and has been twisted out of true with the force of moving stiff hinge pivots.
If you can get the hinge apart safely it is an easy matter to bend the bracket straight again. I think the trick is to clamp one part of the hinge, then apply leverage to the other until you can get the removeable link pin out, then carefully relieve the pressure to release the spring. I'm not sure though - it's a long while since I dismantled a hinge.
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