2 in 5mm ctr
thingiverse
A personalized rendition of this model can be found at http://www.thingiverse.com/apps/customizer/run?thing_id=175044, where you can customize it with the following settings: Hole Diameter - 4.95mm, Rim Width - 1mm, 180 Facet Surface for finer details, Pulley Height - 10mm, Pulley Radius - 25.4mm (standard size), Rim Height - 5mm, and Hole Clearance of 0.1mm for a snug fit.
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