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Hi Nick,
I think many palmatums are difficult to grow from cuttings which is why many varieties are sold as grafts. But if you have a vigorous cultivar it may work: in my book on plant propagation they suggest soft-wood cuttings though and it sounds as if your cutting is already old wood. I know that one bonsaiist often air layers one of his acer palmatums (don't know what variety it is) but that might be an option too if you want to have a new plant with thicker trunk from the word "go".
Let us know how you are faring...
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