I'll vote for godsend.

I use Shubbs, but my all-time favourite was a Heriba, which was a German-made (I think) moulded plastic gismo with a comb-like bar under a soft plastic moulding. It was held in place by a ratchet device of moulded interlocking teeth, which did no damage to the neck, never put your guitar out of tune but made a raucous farting noise when you deployed it!

Haven't seen them in years - probably bought out by Dunlops!