This arrived for me yesterday, full titanium double locking tremolo from Hantug Custom Guitars. This thing looks amazing, the only parts that aren't titanium are the springs and Allen keys pretty much. It'll be going on my Musikraft San Dimas clone.

Hantug Custom Guitars and Parts made some Edge/Lo Pro Edge brass and titanium sustain blocks with my help a couple of years back. These were designed with the original sustain block design in mind, unlike many of the other manufacturers who just make squared off blocks with no spring retainers...