Cyclone PCB 52mm reinforced spindle mount

I try to make Cyclone PCB ( http://www.thingiverse.com/thing:49484 )
2.0 version from github.But it sized for dremel.
My dremel have runout about 0.2-0.3 mm and quickly broke any drill less than 0.8 in diameter
so I try to adopt Cylcone PCB mount to 52mm 300w air cooled spindle from ebay (http://www.ebay.com/itm/300w-12000RPM-Spindle-Motor-Mount-Bracket-12V-48V-Engraver-Cutter-Marker-CNC-/121245097542?pt=LH_DefaultDomain_0&hash=item1c3ac55e46 )
also I have few LM8LUU bearing ( http://www