![THE CONDUCTOR-TELESCOPE](https://modelist-konstruktor.com/img/5802/1.jpg)
Of tubes of different diameter, tightly placed one on another, you can build a jig for drilling end holes in cylindrical rods of various cross sections. For the outer bushings are better to use a steel tube with a thickness of 0.5 mm, and the inner insert can be bent any sheet metal.
V. MARTINTON, Novocheboksarsk
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