If you have to repair a loose or broken joint of an antique, use vinegar to soften the existing glue. Squirt a bit in with a syringe or, if possible, drill out as much of the broken wood as possible. The glue will soften fairly fast, and may be scraped off.
This trick does not work on epoxy or some modern glues, so never repair antiques with epoxy -- someone might need to repair them again some day.
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