Carburetor holder on Cox Medallion motor

Carburetor holder modified L.M.Cox Medallions have been completed adopting with ENYA carbs. I'm not fond of needle valve equipped in TV carb because of  it's stout construction with heavier weight. Unnecessarily too much weight would cause various problems especially in the actual combustion circumstance, destructive vibration produced by inevitable crank shaft knocking while operation might cause resonance vibration.
On the other hand, my way just applying 2 mm diameter screw with the tip shaped   on the potion of the fuel measuring point, because the purpose of needle valve is to measure the amount of fuel flow and fix it to keep the stable motor operation.
The critical part of the purpose is just only the shaped and tapered needle tip, the thumb knob has nothing to do with it. In addition, the suitable needle position does not always change so often so far as we supply 15% Nitro-Methane including fuel.
Consequently, the needle valve set on OS 40 D carburetor directly on fuel supply nipple potion does a part of the purpose enough.I would continue this method for the time being especially checking on the durability.