Help.. with Belt -CP V2 upgrade CNC rotorhead ??

I got his
The main shaft that came with, it is too short ? When I line the hole (up on the botom of the shaft) to put the bolt in under the two gears. The shaft is not going into the bearing at the bottom of the frame ? So with the bottom bolt on, and the collar on top
pushed down tight I can move the shafe a littel up & down (slop)..
The one I orderd was.. ESky Belt CP CNC 7075 Best Head combo update set plus free linkage set assembled. Thanks for any input

Try with original main shaft, maybe that works.

Ya thats the first thing I did and the hole at the TOP of the shaft just under the flybar cage is to low

I think the shaft you got is for the HBK2