Chris. If you have an engine with the air bleed carb can you try it? The less expensive OS engines have the air bleed carbs.

If you close the air bleed screw on those carbs then you only have fuel coming from the main needle valve. I’m not saying this well. I understand that even with a two needle carb the fuel only comes from the main needle valve but I think your air bleed device could work better than the carbs air bleed screw and make those carbs usable. I haven’t built your air bleed device and I’m light years behind you with experience. If you get a chance to try it I would appreciate it. Thanks