I think we've worked out how to adjust it. We built a jig from a ceramic tile. We then clamped the monoblock to the tile. The barrels were not level. Loosening the end cap we then clamped both barrels to the tile so they were level. Then we tightened up the end cap which clamps to the left barrel. This keeps the barrels at the same twist relative to each other. Will test fire later.