I think I would make my own double pillow blocks out of wood with
bronze sleeve bearings. W.W. Grainger sells bronze bushings for about
$3 for three bushings. If you have access to a drill press you could
drill both blocks at the same time so both blocks have exactly the same
spacing and height. The bushings may not last forever, but would last
pretty long. Bronze is what the hobby tumblers use. And replacing
them several times would be cheaper than buying sealed ball bearings.


Dan