A tool for attaching and disengaging a retainer spring in a truck brake assembly comprises a handle, a supporting curved member, a stabilizing tab and a fulcrum rod that enables a mechanic to engage and move into place the retainer spring using a long bar. An optional lever bar with a partially closed hook may be used to more effectively control the retainer spring during the operation.

A device for removing a set of springs from a mattress box spring including a mattress box spring support, a pushing block support frame secured to the mattress box spring support, a pushing block supported by the pushing block support frame adjacent to the mattress box spring support, a cylinder for extending the pushing block over a mattress box spring positioned on the mattress box spring support belt, wherein the cylinder is operable to extend the pushing block transversely over the mattress box spring to separate springs attached to a frame of the mattress box spring from the frame, and wherein a plurality of forks extend in front of the pushing block transversely to the mattress box spring support for helping to prevent the springs from folding underneath a bottom of the pushing block when the pushing block is extended over the mattress box spring to separate the springs from the frame.

The invention relates to a method (19, 19, 39, 39, 59, 59) of assembling a part (5, 5, 25, 25, 45, 45) in the aperture (18, 18, 38, 38, 58, 58) of a component (3, 3, 23, 23, 43, 43). According to the invention, the assembly system (19, 19, 39, 39, 59, 59) includes a system (1, 1, 21, 21, 41, 41) of securing the component (3, 3, 23, 23, 43, 43) and the part (5, 5, 25, 25, 45, 45) to each other, which includes at least one pawl device (11, 11, 31, 31, 51, 51) intended to make the component (3, 3, 23, 23, 43, 43) and the part (5, 5, 25, 25, 45, 45) move integrally with each other. The invention concerns the field of timepieces.