Building a better Guinea and Feather

Step 12 Bearings, bearing blocks, and Aluminum support tubes

The ball bearings are 3/8" x 7/8" x 7/32" wide, McMaster-Carr P/N 60355K14. The bearings sit in a 2" aluminum block with a 0.876" counterbore.

There are two 2" square aluminum support tubes with 1/8" thick walls. There are four more holes and another slot on the opposite parallel face. The bearing support blocks are screwed to the aluminum support tubes so that the screw heads are completely hidden from the outside.