I have replaced the unsealed old pump bearings with common sealed
bearings that cost about $10 each.  I don't remember if I had to use
a shim, or make any other modification, but I doubt it.

Best regards,
Spencer Chase
http://www.spencerserolls.com/ 

 [ Peek under the seal to verify that the bearing has been packed
 [ with grease.  (Occasionally it's dry as a bone.)  -- Robbie