We have found when applying pressure to the brake-pedals it, has put an undesirable amount of pressure on the rudder cables as well as the rudder horn. Our procedure to correct this was to put a full swiveling device that would transfer the pressure from the pedals to the swivel instead of the cables and the rudder horn. To eliminate this pressure we used 4130 steel tubing in two different sizes. One was to fit inside the other, the two sizes I used were 1/2 inch OD and 5/8 inch OD. We made it into a tee shape which allows it to make a full swivel motion back and forth, this is how we did it.  

Part 1 5/8 inch OD 4130  
Part 2 1/2 inch OD 4130  
Part 3 Flat Steel 1/16 inch thick  
Part 4 Angle aluminum 1 x 1 inch   

(A) Weld Part I to Part 3 making sure the angle is correct to the angle the rudder pedals are mounted on. 
(B) Then take two pieces of 1/2 OD and weld them into a "T" with a washer. 
(C) Bolt parts 1 and 3 which are now one part to the floor angle the rudder pedals are bolted to, in a vertical position. 
(D) Weld tab to part 1 near the top but not to interfere with the swiveling  "T" This will be used to bolt angles Part 4 to. 
(E) Bolt angles Part 4 to the floor in front and at Part 1 also. 
(F) The T bar should hit just below the "T" on the rudder pedals about. 1/2 inch down. 
(G) To hold the "T" inside Part 1 you have to cut a slot in the "T" so as to insert a sheet metal screw and drill a hole through Part 1. 

This will hold the T but allow it to swivel. I have found that this works very well and is light weight and very strong and easy to build.

Steve Craigle describes in newsletter #20 (July, 1992)  with an amendmend in newsletter #21 (Spt., 1993) another resolution of this problem:

 << Steve has also optimized the placement of the rudder pedals/brake cylinders. He was interested in a configuration that best keeps the top of the pedal (the brake) vertical throughout maximum rudder deflection. I always thought it was good to get a little brake actuation when nearing maximum rudder travel. That way I don't have to actually think about pushing on the brakes when trying to control a ground loop? See Figure 2 for the dimensions that Steve came up with. Shims can be placed between the gear and the link to change the angle that the gear comes out of the fuselage (and the camber of the wheels). >>