If you want ordinary “card” loop was samarastroydetal like spring-loaded, easy to upgrade. For this of eyes loop is extracted axial rod, and the reverse installation is put one or two springs so that their ends rested on the loop. Eyes for necessary for this file.
Recommend to read
OF THE SATELLITES — TANDEM
Description a three-wheeled tandem, published in the journal (№3, 1979), I liked inherent in it the idea to tandem bike of the usual single, without making major changes to the original...
THE BEST OF THE BEST
Case microsociety class S6A (Fig. 1) champion 1986 A. mityureva formed of two layers of fiberglass with a thickness of 0.025 mm and subsequent treatment with sandpaper. The mandrel of...