Modern gel or Li-Ion batteries (such as AntiGravity Batteries) offer a significant advantage - they are leak-proof

Knuckles have been around for almost 80 years

Note that the diagrams are just examples

Standard socket head allen bolts can be used

Rotor Sprocket Pulley Spacer 1/16" Stainless Steel for 2000-later Harley Rear Wheel Vendor_After Hours Choppers Modern gel or Li-Ion batteriesThis 1 16" (0. 063") thick stainless steel spacer spaces the brake rotor, sprocket or pulley away from the hub on the rear wheel of 2000 & later Harley Davidson motorcycles. Properly sized to accept the stock 7 16" diameter mounting hardware. Multiple spacers (of the same or varying thicknesses) can be used to properly align the rear wheel as desired in full rigid frames or any other custom application. Made in the USA.