On Sep 11, 3:09*pm, Higgs Boson wrote:
Amigos y amigas, this has been bugging me for years. *I was taught
that after opening a faucet to its fullest, one should "back off" a
little.

WHY???

I can think of a couple possible reasons.
If it's opened all of the way, you can only turn it one way to loosen
it, and you lose the old, tighten it first before trying to back it
off routine.
Depending on the faucet, maybe the packing would be squeezed and take
a set, then when you tried to close the valve it wouldn't hold.

R