|00:51Open back banjos use bracket shoes to hold the tension hooks that pull down the tension hoop. These bracket shoes are usually attached by a machine screw that passes through the rim and is secured by a nut on the inside. Some of the higher quality instruments, particularly the Whyte Laydies and Tubaphones, use a bracet shoe band that is a metal band that slides up the outside of the rim from the bottom. The rim is turned (cut) to a smaller outside diameter from the bottom up to the point where the top of the band meets the wood.
This is easier to see than to explain. The shoes are attached to the band by screws that pass only through the BAND, from the inside of the band, so that no screws pass through the rim itself. This allows for a solid rim that has more freedom to vibrate and a more massive pot.