A shaft adapter configured to be removably-coupled to shafts of differing diameters. The shaft adapter may have a stepped cylinder cavity with multiple inner diameters. The shaft adapter may further have a spring-loaded adapter ring configured to translate along an inner wall of the stepped cylinder cavity, and may be configured to support an outer wall of a first shaft received into the shaft adapter, or may be configured to be urged into a compressed position when the shaft adapter receives a second shaft.