About this 3D model

This is a “rivet” (don't know the exact word) for spinning the gears of [Emmett's awesome automatic transmission model](http://www.thingiverse.com/thing:34778). My printed model was quite tight when I put the gears together. After oiling it, I printed this piece and used a drill with a flat screwdriver end in slow-speed mode to make the gears spin for a while in both directions from both suns, and it's now rotating quite freely.