The feathering shaft for the Walkera 36#B CNC rotor head:
These are available from
The feathering shafts for the Walkera 60#B and 68#B, Align 450xl 3mm shaft, the Hobbyking 3mm shaft will also fit.
However, the 36#B rotor-heads are problematic.
The pitch crank fixture tends to slip on the blade holder.
The small radial bearings 3x6x2.5mm (id, od, wth) are prone to cogging effect.
The slightest free-play occurring to one blade holder either holder to bearing or bearing to feathering shaft, and the tracking will be effected. If the tracking is out, the 36#B head will not produce much effective lift.
Also, if the feathering shaft is out the main shaft may-well be out of true too.