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The Fender Jaguar and Jazzmaster guitars had a tremolo that could be
immobilized by simply rotating the arm to face towards the tail of the
guitar. The only disadvantage to it was that it was also limited to
loosening the strings by pressing down, but could not tighten the
strings by pulling upwards. It did stay in tune better than the type
used for the Strats.



I have a Peavey electric that operates that way. I think it depends on what
brand of bridge they use.

Eisboch