Picked one up to do a set-up back when I worked at GC; looked at it, thought about it, put it down, and set up an instrument with a sensible wiggle handle instead,
That was 42 years ago, and I have yet to attempt one.
Peter (who whammies little - but when he does prefers the basic magic of a Bigsby; I mean, did Floyd use a Harley-Davidson valve spring in any part of his [over]design? I think not.
But I might buy one if young ladies like that will lean over my car and take care of the fool thing.
Peter