Any is, perhaps, too, but the hole in the tree Ø 20-55 mm this tool to drill. Drill-Perca consists of a Central rod of square section and two blades, pivotally attached to the rod. Sami knives carved from overage mills.
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The main element of such a tool is a hydraulic Jack used for lift trucks. The lift is rigidly fixed on a steel baseplate to fit. On the rod of the Jack is put on a mandrel of aluminum...
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