So long as you have pushed the bearing into the cassette deep enough, you should be able to turn it most of the way by hand.
Make sure that the collar of the bearing is going to protrude on the correct side of the cassette before you fully locate it, just to save some tears.
I grease the inside of the cassettes so that the bearings can move when the kart is twisting the axle under driving conditions.
just for reference, the sprocket side bearing collar is usually inside so that the sprocket carrier can't foul it.
The brake disk side usually has the collar on the outside.
The third bearing can be mounted either way and you can usually discover which way round it was by looking at the marks on the axle.
When you do the pich bolts up I screw it in until it just bites and then just do it up by about 5-7 minutes.
This allows the bearing to resettle as the kart twists.
A strip of gaffa tape over the screw heads and and over the side of the cassette will prevent them dropping out.
Try to use the old grub screw location marks as this can help in preventing unexpected axle breakage due to multiple marks, especially in soft axles.
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