Install on the rudder pedals where the tension springs are located a
carriage bolt with the round portion of the head ground off, drill a hole in
the rectangular portion of the head to insert the spring ends and fabricate
a mount for the other end and use a wing nut for variable tension
adjustment.  I used different springs than those provided in the plane kit.
The objective is to use the lightest tension possible but accomplish the
effect to impart a differential load on the system.  Does not take much to
do so. You load one side more than the other by tightening up one and
lossening the other wing nut.

Bob Smiley