I'm working on an old banjo that has unusual shoes. The pot is 3 1/3" deep, the shoes are 2 1/4" long, and the bottoms of the shoes have hooks that grab the bottom of the all-metal (non-ferrous, looks like nickel over brass) pot. As a result, there are no penetrations of the pot, similar to the Whyte Laydie construction. The upper part of the shoes are threaded into the side of the tension hoop. The exterior of the tension hoop has decorative, knurled "frames" between the j-hooks.