From "DocThrocks" website
rudderpedalsinstalled3.jpg
**Service Bulletin: 8/05 a service bulletin was issued by TR to ensure adequate clearance between the outside lower brake pedal to rudder pedal attach bolt. It seems there have been problems with the bolt head hanging up on the firewall and disallowing full travel of the pedals. This could be an extremely dangerous situation in the air, and especially on the ground. It is recommended that you have at least 1/4 inch clearance between the bolt head and the firewall. Some builders have simply ground the bolt head down or used a pan head bolt, as well as taking a ball peen hammer to the firewall footwell junction and knocked it back. It has also been recommended that prior to pedal assembly that the rudder pedal cross tubing (horizontal part) be cut from the upright thin hangar, and reduced 1/4 inch. Then you can insert a spacer and shift the outboard part of the mechanism away from the firewall footwell and gain adequate clearance. It has also been recommended that if you cut this part to shorten it, when you re-weld the part it's a good idea to slightly rotate the flat upright so that the horizontal cross tube of the left and right rudder pedals are parallel.
*** Update 12/07:
Although I thought just changing the screw on the rudder pedal that was hanging up on the footwell would solve the problem, it DID NOT. I was taxi tesing my Rocket and the right pedal was hanging up badly on the lip of the footwell. Malletizing it just wasn't going to happen. So instead, I got a nice long thick bolt and nut, and a deepwell socket. I used the socket/bolt combination as a jack screw. I blocked the inboard side of the footwell with some wood, and then drove the head of the bolt into the area of the stainless firewall where the hang up was and dented it out. Not a very sophisticated method, but screwing the bolt out of the socket and bending the footwell about 1/8 inch or so gave plety of clearance. The tendency for your legs at an outboard angle and the pedals swinging at an outboard angle will predispose you to hanging up on that brake pedal screw at absolutely the wrong time. Go ahead and bend out the lip of the firewall footwell adjacent to that screw. Thank me later!
I used a pan head screw (actually a bolt). There is NOT enough clearance as is, even with the pan head. You can see in the pic that there is not much clearance. If you assemble the rudder and brake pedal assemblies trying to bias everything inboard, you should be able to get at least the amount of clearance shown. Mark recommends perhaps twice this much, which would mean cutting and welding the pedal and perhaps reshaping the brake pedal. If that bolt hangs up, you can get in some serious trouble! I went ahead and dented out the stainless firewall adjacent to the pan head.