It does need a guide block
Hi Todd,
I have a stock panel and installed it on the lower L/H panel support brace.
I Installed my rudder trim while building and found the springs do catch a bit on the lower sub-panel.
My fix was a simple piece of plastic 4" x 4" pop riveted onto the bottom of the sub-panel to allow the spring and cable to glide over that spot. (the plastic guide has a slight crescent shape)
The springs only contacts that spot at the top of the arc as the pedals move,so its not like they are dragging there all the time.
I also mounted my Rudder Trim off-centre to the pedal arms,while not ideal,it works fine at this location.
(you could mount it on the underside of the panel support brace,but I preferred the cleaner look of mounting it in line with other switches)
The only problem I have had was an internal grub screw worked loose and allowed the trim cable to slip,on dismantling the rudder trim box,I found that this was the only screw that was not Loctited. Re-assembled and all good.
2 years and over 300hrs and I like the Rudder Trim and would fit it again if I was building.
Cheers,