A universal mounting assembly for quick mounting of an object to a stand device. The mounting assembly includes a body having a support surface, a front face and an opposed mounting surface configured to mount to the support stand. The front face intersects the support surface and defines an opening into a receiving socket of the body. The body further defines an elongated slot extending along and into the receiving socket from the support surface. The elongated slot having a transverse width dimension smaller than that of the receiving socket, although it is suitable to receive a transverse width dimension of the button device neck portion. The receiving socket is formed and dimensioned for sliding receipt of the transverse width dimension of the head portion therein as the neck portion simultaneously slides along the elongated slot to a dock position. The mounting assembly further includes a resilient retaining arm cantilever disposed in the receiving socket. The retaining arm includes a contact portion movable between a released position and a locked position, locking the head portion to the body when at the dock position in the receiving socket. A manually operable locking wedge moves between an unengaged condition, enabling movement in the retaining arm toward the released position, and an engaged condition, preventing movement of the retaining arm from the locked position toward the released position.