Sugestion: give us the opportunity to configure out Axis.

[NedLynch]

I have the radiator on an axis as well and in a hurricane and spit it works just that way, you put the axis to 75% and the radiator goes to 75%, the oil radiator in a 109 works that way as well, it's only the water radiator in a 109 that works differently.
My guess is it's because it is not a lever but a turn "wheel", so if you push your axis forward you keep opening it until you center your axis again.

I know you said the trim, which is also a wheel, works fine on an axis, didn't map that one to an axis but I sure will try it out now.