#$%^&*AU2011203223A120120202.pdf#####ABSTRACT Coupling systems and methods enable adjustable utilization of counterweights and other components on vehicles, such as riding lawn mowers. A mounting bracket and pivoting locking plate are operable to releasably secure a component, such as a counterweight, to a vehicle without the use of tools. Responsive to insertion of the component into the mounting bracket, the locking plate pivots to secure the mounting bracket to the vehicle.3 100 130 110 - 4W 0 0100. 110 130 FIG. 2B 1006 110 130 313 340--O 332 362 FIG. 3A