Bolt and bushing set for SPOOLHOLDER by JohnSL
http://www.thingiverse.com/make:187480
You will need 4 sets of these.
My bearings had an ID of 9.5mm.
The bolt shaft is 8mm if you get 8mm bearings you may not need the bushing (maybe some washers though).
M8_Bolt_and_Bushing_Set.stl | 535.8KB |