I used some small strips of .005 brass to cover the joint at the end of the supports, use plenty of solder, you can file it down in a bit!

Solder the 3/32” brass pivot tube to the supports.

Solder the back side of the yoke support tube to the forks, use plenty of solder.

Using a file, clean up the solder joints.

Cut two pieces of 1/8” brass tube and make a small washer out of a servo arm that is as thick as your PC board. These will keep the retract arms shown in the picture centered. Slide the 3/32” brass tube through all of this to mount your retract arms to the forks.

Assemble the upper supports and retract arm. Adjust your retract unit so that the steering arm is parallel with the mounting plate as shown and mark it at the top.

Solder the upper support bearing on.

Cut the retract arms 3/32” axle off leaving just about 1/16” sticking out of the side of the forks.