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
Not a spring, but gravity
The finishing touch of any dacha fence is, as everyone knows, a wicket gate. Country homeowners often equip them with simple devices that automatically close the gate after someone passes...
SCOUT-SPOTTER su-12
...1947. Air parade in Tushino. Thousands of viewers saw a new, unusual and, moreover, the plane. It was a monoplane su-12 (RK), constructed under the direction of P. O. Sukhoi. It was...
