a deck plate having a bottom surface configured to rest against a skateboard deck and a top surface spaced from and opposite of the bottom surface, a primary pocket comprising opposing side surfaces and a primary retaining member above each side surface and extending toward an axis of the deck plate, each primary retaining member defining a retaining surface facing towards the top surface of the deck plate;

a retaining member traversable between a locked position and an unlocked position and spring-biased toward the locked position; and

a base having a primary insert, a seat surface and a pivot receiver, the seat surface being on an upper surface of the base and having an aperture to have at least one part of a hanger assembly mounted on the seat surface, the pivot receiver configured to receive a pivot extension of the hanger assembly to allow for the hanger assembly to pivot, and the primary insert having an upper surface, side walls, and a back wall;

wherein the primary insert and the primary pocket are sized and configured so that the primary insert can be received within the primary pocket and when the primary insert is received within the primary pocket, the retaining member is in the locked position, the primary insert side walls register with the opposing side surfaces of the primary pocket, the primary insert upper surface registers with the primary pocket retaining surfaces, and the primary insert back wall registers with the retaining member.