This simple device facilitates the use of any tube, helping to squeeze it evenly and gently. It consists of a base in a hole which is inserted the tube, and turning a key with slit for exciting a planar end of the tube. The base and key are made of wooden bars of appropriate dimensions. Their interaction is clear from the figure.
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A horizontal strap, with teeth so attached to the middle of the handle — that, in fact, the whole design is as old as the world agricultural implement, without which no gardener-lover or...
