A convertible, multiple function shelf unit includes shelves which can be supported horizontally or on an incline and having opposed edge members extending from the shelf. The microfibers are selected and present in amounts such that the wiper exhibits an average effective pore radius of less than 50 microns. The largest or resulting vector is determined from the individual vectors, then the main bearing pins and crankpins of the crankshaft are roll straightened with a roll straightening force the size and direction of the largest or resulting vector of which is between 0 and a multiple of the largest or resulting vector. During the steps of shifting the contact point to obtain the second stage 10 the contacting process is more accurate and reproducible than the process for establishing the initial contact. A controller device is coupled to the nonvolatile memory for measuring the health status of the nonvolatile memory by determining the number of growing defects on an on-going basis.