If a plant really gets into trouble, pieces of relatively green stem segments will root easily in plain water. Many advanced growers suggest rerooting new plants every few years, because old woody plants can become more sensitive to root issues if they aren't repotted often enough. Taking a whole branch will produce a plant whose blooming will not be disrupted.
I knew a member of the Henry Shaw Cactus Society in St Louis who rooted individual joints in tiny plastic milk jug caps with water. Of course you can't let them go dry even once.
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