The only time I need rudder trim is in cruise. For local low speed sight seeing the ball is about centered.
I usually sit there with my left foot applying a slight amount of pressure to keep the ball centered. Obviously, that gets tiring after a while.
The mechanics have not yet been worked out but a solution could be a left rudder cable brake of some sort for long cross country flight. Something that would clamp and hold the rudder cable until not needed.
If I ever figure it out and it works, I will post it.
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David, try this..... on the center nylon block, remove the washer and tighten down on the nut to increase friction on the cross tubes. Enough to be a pull by hand, but your feet won't notice the difference.
With the friction set, the rudder can be set in position during cruse with just a tap on the pedals. If you can't get enough friction, you might need to do the same to the end blocks also. This has worked great on my 6A for 300 hours.