Is there such thing as a double locking tremalo for bass? If so, which brand makes them?
Kahler makes some.
No their's aren't even single locking. There's only been one non-custom double locking bass trem: The old Steinberger Transtrem. And, depending on who you're talking to, there were between 200 and less than 150 made. A Transtrem equipped bass appeared on ebay a few weeks ago. The body and the bridge were the only original parts, and it still sold for $1000. And they usually go WAY more than that.