Throttle lever problem

[Lona]

My throttle lever won't overcome the pressure of the main gas pedal linkage spring with the result the lever just slips back to the idle position when I let go of it. Yes, the detents on the throttle quadrant are worn but not so badly that the lever shouldn't at least try to stay put where I position it. The throttle lever linkage pulls on the main foot pedal linkage to set the engine speed and this seems to be the way it is supposed to be. However, the main linkage spring seems to be too strong and forces the throttle lever back to the idle position. On the other hand, there does not seem to be any abnormal effort to push down on the gas foot pedal.

Does anyone have a solution to this problem? It doesn't seem that filing the quadrant grooves deeper would make the lever stay put because of the spring pressure making it return to idle. Is there any way to reduce the tension on the main linkage spring? Is there another solution?

Appreciate input anyone can give.

Glen