Getback,
Not sure what u mean by fit?
Does the throttle not go "wide open?"
When calibrating your throttle, when you're instructed to move the throttle to the 'open' position (full foward) move it until you hit the stops and then move the slider slightly down so it's about "90%" open and then press a button on the stick to set the calibration.
With today's sticks, it's really not needed as much but since CH still uses potentiometers, it's a good tip to avoid any possible spiking (which was common in the legacy days with analog gameports with slow speeds) when the throttle is at the full position. The same tip can also be used when calibrating the 'closed' position.
ack-ack