balanced with complete/full/half featherkey tech.

[zoira]

As standard, the rotors are dynamically balanced with the complete
featherkey inserted.
The type of balance is marked on the drive end of the shaft (shaft
end face) or on the rating plate:
(F = balanced with full featherkey)
(H = balanced with half featherkey)

[DanaLana13]

feather key 
– noun Machinery.
a rectangular key connecting the keyways of a shaft and a hub of a gear, pulley, etc., fastened in one keyway and free to slide in the other so that the hub can drive or be driven by the shaft at various positions along it.

[zoira]

а как конкретно на русском это будет?