I've had this horn in the works for a good long while now, and it's done!
Two corp 50 bells- one cut, one stock. The uncut bell is one of the best 50 bells I've ever played. The spacing is Greenhoe, so I can swap all sorts of things in and out
Copper Hoelle tuning slide, now reversed
Olsen/Instrument Innovation axial valves (fitted by Mike Olsen himself)
Lightweight valve section- short tuning slides, one spider brace
Edwards V single bore slide or Shires B62/78 slide
This thing is a MONSTER. One of the best playing bass trombones I have ever played, but still has a bunch of Bach character. These valves are IMO the best on the market when they are set up right (when they are not... they are not). Easy to play, not air hogs, I can just use my normal articulation in all ranges. The most ridiculous pedal range of any bass I've played, but the horn still has an easy and centered high range up to high D. It feels like one of those "excuse-enders," where the horn does everything it possibly can- if you miss something, it's definitely your fault!
The valve section is quite wide, but it still fits in my Bonna screwbell bass case, so who cares!
Really happy with how this turned out. Check it:



