[SML] ETC Safety cable loop

[billn at peak.org]

> I have only had one light fall in my presence, when the cast iron C
> clamp cracked and fell apart when it was being tightened.  The safety
> cable had already been attached, and caught the light, but the chunk of
> C-clamp fell down and damaged a (fortunately) empty seat.

Which is why I never do a hang/focus when someone is close to being under the
instrument. I have never had one fail, but have heard enough stories about it
happening to be unwilling to take the risk.

> I started attaching the safety cables to the cast in loop, and got
> immediate push back from many others on the various calls I was on who
> said not nice words about the blankety blank who was doing the safety
> cables wrong.   So I stopped.

The snap hooks are easy to attach to the eye, but a pain to remove - at least
that is true for the size of snap hook on our cables.

Bill