A knowledge-based system under uncertainties andor incompleteness, referred to as augmented knowledge base is provided, including constructing, reasoning, analyzing and applying AKBs by creating objects in the form E\u2192A, where A is a rule in a knowledgebase and E is a set of evidences that supports the rule A. The slipping clutch arrangement includes a slipping clutch spring engaged at one end to a pinion of a rack and pinion assembly and at a second end to the ratchet pawl. The handle fits with its hole over the element with the formations interengaged, the screwthreads not engaged, and the bumps in the groove. As a result of the partial bridging of the compressible intermediate layer this is offloaded from forces in the direction of rotation.