Parts

This is the larger of the two pulleys on your base unit. There are two different sizes, one for a large base unit which has a 1/2" bore hole in the...

This is the rubber covered rods that the barrels roll on.  The rods come in 2 different sizes 1/2" diameter by 20.5" length for the large base unit...

These come in two different sizes, 5/16" bore hole for the large base unit and 1/4" bore hole for the small base units.