Had not actually thought about the shear strength of the extension itself. I imagine they very in strength.
I must say I have never once seen a 1/2 extension break, even cheap ones under massive twisting torque.
I could imagine a safer setup using, say, 3 locking 'quick-links' going right around the coil, each attached to a short length of chain going back to a hook or shackle on the 'main' chain. Both the links and the chain would have a known rated capacity. Coil would be truly captive regardless of any imaginable manipulation.
..or a heavy plate with a serious loop welded onto it.
Just some ideas. The likelyhood of your setup slipping is probably quite small, but I am paranoid about such things.
1986 300E 5-Speed 240k mi.
Last edited by csnow; 10-02-2003 at 11:49 AM.