The control linkages for the foot pedals installation are identical to the basic helicopter, with the exception of a pedal friction mechanism with a preset friction tension. The pedal friction mechanism (500N only) offers the pilot an artificial feel or workload of a conventional tail rotor system.
http://download.mdhelicopters.com/et...0/67203040.pdf
Anti−Torque Pedal Friction Installation
(1). Using two pieces of wood and C-clamp or rope, secure pilot's pedals in mid position so they are aligned within 0.50 inch (1.27 cm) of each other.
(2). Install washer, bolt, bushing, and link assembly to bracket assembly on instrument console.
(3). Install brace and clamp arm assembly to anti-torque tube assembly.
(4). Install friction disc, link, retainer and spring, install washer (shim washers if required) and nut.
(5). Torque brace and arm assembly bolts 30 - 35 inch-pounds (3.39 - 3.95 Nm). Torque nut against washer to obtain a pedal friction of 5 - 8 pounds (2.27 - 3.63 kg)