The additional high speed addons are using R8 inserted spindles. So the 9k spindle is a gearbox that is inserted in the existing spindle. Run out on the existing spindle is a respectible .0004". It's got all the regidity, makes sense to use it. The 30k rpm spindle is air powered. Each spindle only takes away 2" of travel.
I've never tried the add another spindle to the side trick. Maybe that works well too, but I fear for the life of the bearings in those little hand tools.
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