GT2 Idler - Snap together

These Gt2 Idlers come in two halves and are designed so 2 623 bearings ( http://amzn.to/1Rx65BE ) go inside. Once everything is fit and tested I JB Weld ( http://amzn.to/1PoUvRg ) the two halves together then file the the seam...

I designed these to be tight fitting so filing is required. Cleaning out the hole for the bearing is easiest with a 10mm endmill being careful not to go through the bottom.