The metal bars slide over a smooth greased surface. Two screws at the top
left make the end stops. The centering force is made via double bungee cord
at each side, which is fastened near both sides of the flight stick (top
right picture).
The rotation of the metal bars is transferred via gears to the rudder
potmeter (originally the twist handle potmeter of the Logitek Wingman 3D FF
joystick)
Update: gearing to potmeter, with the gear now fixed on the bolt of
the front bar. Less give, no problem with potmeter skipping some gear teeth.
The pedals brake spring force has been increased by adding small pneumatic
cylinders. (Stripped from LCD monitor stands)
Also the mini transducers are still used on each pedal. The brake function
uses micro switches, which are connected to two of the Logitech joystick
switches.
Update: Tried to simplify the hinge of the pedals. But the method as
shown above with the hinge at the bottom of the pedal will result in
unwanted pushing the brake while steering with your feet. This is because
your feet will apply force at a point just above your heel. So the hinge
point needs to be there as well in order to be able to apply rudder force
without rotating the pedal. See below.
Also added a spring to the pneumatic cylinder for increasing the braking
force.
Keep in mind that your feet are strong; you need significant force for a
good feel.