For my twins I make a "shoe" that goes into the battery compartment. The rear of the shoe has a 1/8-inch tab that fits into the 1/8- inch slot that is used to hold the rear of my battery plate. The front of the shoe is bolted to the 1/8-inch Lite Ply floor of the battery compartment. The front of the shoe has a blade that fits into my rotating stand.
Later - Bob