Which feathering shaft on Belt CP?

[Merlin.swe]

Purchased some bling parts for my Belt CP, aluminium central holder set and main blade grips.
Both sets came with feathering shafts, the central holder with a shorter one and the grips with a longer.
Can someone please tell me which shaft to use?

[Blusaber]

With the cnc blade grips you use the longer one 47mm if your only using the head with the plastic grips you use the shorter one.

Gary