Steel Spring Straps:

Design from: http://www.cyber-strategy.org/pers/FinStraps.html

Construction is based in two pieces of 10mm wide 1,5 mm. thick 302 stainless steel spring (302 is the highest steel grade that still maintains elasticity enough to make a tension spring). Each piece is approx. 24 cm long.

Protection hose is 12 mm. transparent vinyl and terminal hose is 10 mm. black gas pipe.

The S shaped hooks are 316 stainless steel, 4 mm thick.

A thin braided nylon cord (1,8 mm) is threaded through the springs and tied to the end loops to prevent the springs from overextending.

The S hook, the spring end loop and the safety cord