Starting a towing device (Fig. 1) easy to produce in any model circle. In the absence of a lathe it can be made flat, which, however, some will increase size, but will not affect performance.
BELOW NAVIT SPRING
Using just two wooden bars, metal bars, vise and elastic steel wire, we can quickly produce the spring. Its length depends on the number of turns around the rod, operated by a bunch of wooden beams, between which is passed the free end of the wire.








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