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in Problem solving
I would cut it hard back - to about 4 or 5 good buds above ground level, cutting to an outward facing bud. Prepare the soil well, some microrhyzal treatment applied to the roots would help, and plant deep, a couple of inches below current soil level.
We transplanted a mature Mermaid rambler to my daughter's garden this way, and it is now rampant all over the back garden wall (one of the best intruder deterrents known to man)