90 degree angle gearbox, shaft 6 mm

Dimensions of larger models like the Robinson R22 are reflecting to the range of accessories.
The aluminium tail rotor which is in use here, varies among other things by a 6 mm tail rotor shaft for which again all further accessories are mated to 6 mm. Blade holder and cotrol bridge comply to this dimensioning as well.
90 degree angle gearbox with aluminium housing, kit-form.