A lithium ion secondary battery includes a positive electrode, a negative electrode and a thin film solid electrolyte including lithium ion conductive inorganic substance. A rigid annular guide member is disposed about the oscillation plate with a slight gap therebetween, such that these members are mutually displaceable in the axial direction. The predefined criteria can be that the bootstrap response does not identify at least one new peer within a predefined period of time, or that the bootstrap response does not identify at least one new peer at all. The chuck member andor the pallet member areis provided with at least one damping element consisting at least partially of a compressed composite of metal chips. A novel method of installing each blade can include angling the blade to the mounting ends of the blade arm so that the outwardly extending lip edge catches on the third slot in from the mounting end of the blade.