Hal Meyers (former Seattlite now in Oklahoma), supplied a salvaged hub for the Hill-Climber. At bottom, diagram of the ABC brake and the two-speed hub from the Columbia catalog of 1903.

below, demonstrating where the original 3-speed gear fits onto the one-speed salvaged spindle

below, where the brake drum (when found) should attach

below, an exploded parts view

below, a detail from the 1903 Columbia catalog explaining their own two-speed hub