Normally best to soak any bearings/bushes in oil prior to fitting. If it has not yet been put in the car try and get it to all ends to soak in by capilliary action.
What do you mean by spire nut? They are normally like a folded plate with a hole for crew/bolt entry and a threaded hole the other side, and clip over the edge of a sheet with matching drilled hole for fixing (lousy description). Also known as a speed nut or U nut, or with a nut folded in as a cage nut. Not aware of these in the starter, where does it fit?
Alan
Saab 9000 Stg 1
Saab 9000 2.3 FPT Auto
'81 TR7 DHC