Graham Potter’s hands doing the screwing (into a larch). The image is from a video on styling an old larch (the same larch, and the same video we used a few days ago) on Graham’s Kaizen Bonsai site.
It’s another way to do the same thing
Often, when you want to use wire to pull two parts of a tree closer together, you can find branches or stubs or something else to fasten the wire to. But what if you can’t? Or what if you can, but you are concerned about the wire damaging the part of the tree you are fastening it to? Well, there’s always a screw or two laying around you can use. On most trees screw wounds will easily heal, and even if they leave a small scar, that shouldn’t be a problem in most cases.
Graham uses one hand to pull the two pieces closer together and the other to twist the wire tight (using pliers). If he wanted to bring the pieces ever closer together, he could insert a short stick (or piece of heavy wire) between the two strands of wire and slowly twist.