STEP FIVE:
Drill six (or however many dog accessory hangers you want) 1/4" holes for the bolts along the bottom side of your bone. Mine are 3/4" from the bottom, spaced 3-7/16" apart and centered. This means the end bolt started about 3" in from the round edge of the bone. Just lay it out first with marker to be visually centered when using dissimilar size round ends like my sample.