To hold the Needless in Place,You can use Vaseline.
For the Picco 90XP i need 25 Needles with 2mm Diameter.The Big End Bore is 13mm.
It is very important,that the Needless are from 1 produktions Charge - Batch,so the Diameter is the same.
Deadly for a bearing is,when some Needless are bigger...