NOTE ... these are earlier possibilities, discounted because of price, and unnecessary difficulty of mounting.
Go the easier, cheaper solution (except that bearings have to come from the U.S.).
Bearings
- From http://www.smallparts.com.au
- Bearing Part B4-TB. In stock. ID 20mm, W 24.7mm, 47mm OD $20.71
- Pressed Housing Part PFL-4, 90mm x 67mm, $8.50
