If the tank height is right, needle settings are not too critical on glow engines. I guess I should add that with the correct prop size also, because it you overload the engine ( like OS is prone to do for noise reasons), they are much harder to needle.

I have flown airplanes with the needle valve inside the cowl, where the only way to adjust it was to shut off the engine so I could reach the needle from the front between the cowl and spinner. Once you get the engine broke in, the high speed needle setting rarely need more than one or two clicks day to day, and the idle need never needs adjustment. So I'm not a fan of extensions on a needle.