I decided to go through all 14 pages of this thread. I spent many hours trying to get my fuel level in the bowl correct, whatever "correct" is. I even fabricated a plexiglass model of the fuel bowl so I could actually test the float in combination with the needle valves, which I know are NOT grose valves. I also found I was totally wasting my time by measuring the distance from the top lid of the fuel bowl to the top of the float, which we now believe was meant for grose valves. The critical measurement I've learned is the actual fuel level in the nozzle, not the bowl. Either .426" or 10mm would be the level of fuel below the carburetor bridge. That level happens to be based on the fuel level in the bowl, which is determined by how one bends the tabs on the float itself. Some of us have discovered that to get the proper fuel level, the float is actually too high in the bowl and is dangerously approaching the lid of the float bowl. As you can see, CO has fabricated some brass screws that when inserted into the float will help the float attain the proper angle when the fuel level is correct. I have fabricated similar screws and will drill and tap holes in the float as CO did, and hopefully after re-adjusting the tabs will finally have the proper level. I will report back with my findings, but from I've read from CO, I am expecting good results. Jim