The DOS variator is designed for 18x14 roller weights. It's pretty difficult to find any 18x14's in weights light enough to work on my moped so i'm going to use 16x13's. The variator is pretty nice, cheaper and cleaner casting than a TJT although a tiny bit heavier. A brand new Endurance belt runs perfectly to the top of the ramp with the variator maxed out.
So with the variator open, the lowest the belt will go is 10 or 12 mm from the bottom because it's designed to hold 18x14 weights..
So the inside area around the bushing is what you need to cut down. I used a dremel cut off wheel, first just leveling it to the tops of the roller fences and them smoothed it out. I removed 1.5 mm. If you had a mill or a lathe this would be easier, but a dremel works fine.