The lower a pull rod is located on the bell crank finger the farther the changer finger will be pulled.
Pedal steel changer finger.
This movie shows ross shafer making changer finger stops for the new sierra pedal steel guitar.
If this still does not give you enough pull the pedal stop may be the reason.
How they are designed controls how well they stay in tune and how temperature affects tuning cabinet drop and many other things that we just take for granted.
On guitars with modern all pull changers there are 2 basic types of mechanisms.
Hold it there and tune with the left hand at the keyhead tune the string.
In this configuration the raise finger goes up and around the bridge pin finger shaft and resides next to the control finger.
The changer housings are made from an extrusion and designed so that the steel changer axle is supported between every finger eliminating any possible axle deflection.
The changer finger is where the ball end of the string is anchored and is the main point of contact for the string s vibration to resonate into the wood body.
On gfi pedal steel guitars basically the strings are tuned to their open pitches using the tuning keys or keyless knobs and the pedal and knee lever changes are fine tuned using the nylon nuts accessible through the window at the changer end of the guitar the student models have a slightly more involved tuning procedure.
If adjustable the pedal stop can be tightened or loosened to increase or decrease the pedal travel distance.