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.
Recommend to read
SU-2 — BOMBER MIDDLE
In 1936 the staff of A. N. Tupolev was given the task to design and build a new double multi-purpose aircraft. The implementation of this task was entrusted to the team of Pavel...
A PIECE OF IRON WILL BE SHARP
Qualitatively the condition blunt piece of iron of a plane is not easy even for an experienced wizard. Especially manually. As anyone tried, but to preserve the desired sharpening angle...
