A combination that preferably includes at least a main body portion, a heel portion hinged to the main body portion, and a toe portion in sliding engagement with the main body portion, which collectively forms a ski boot attachment by steps for assembling a ski boot attachment is disclosed. The ski boot attachment preferably assembled by steps that include at least installing a spring mount within a component cavity of a main chassis, positioning a release spring within the component cavity, placing an extension control member within the component cavity in abutting contact with the release spring, compressing the release spring with the extension control member, sliding a slide member into the component cavity into sliding contact with the extension control member, attaching a main spring to the spring mount and the slide member, and securing a chassis cover to the main chassis.