With a conventional disk changer, it takes a long time with poor operability to directly and visually confirm which tray has a disk or which tray has which disk in a device. The sugar solution is preferably at a concentration of from 20-60% sucrose to yield a low density material having high flexural strength and low thermal conductivity when carbonized to a temperature of about 1800\xb0 C. to form a pure homogeneous Li and Fe phosphate precursor, and annealing the precursor at a temperature of less than 800\xb0 C. The device also relates to a winder comprising a winding body, for winding a material, a drive device, for driving this winding body, an a control device. A vacuum squeegee pickup head trailing the wiping assembly lifts the remaining film of cleaning liquid completely off the lane surface, whereupon lane dressing is applied at the rear of the machine utilizing a dressing dispensing head that, like the cleaning liquid dispensing head, reciprocates transversely of the lane to dispense dressing in a pattern preselected by the operator. New and useful structure is provided for coupling the ribs to the compression ring and to the lower ring.