A method and systems for analyzing the quality of high-speed signals, when signals can not be over-sampled due to sampler clock rates, is disclosed. The method includes providing a classifier to predict a performance characteristic of the line based at least in part on a value of an auxiliary variable. The handle provides control of a high speed polisher in a stand-up position, the storage bin provides an area for the placement of weight and for storing of all items upon when not in use. Of these two sections of the closed space 57, the one on the side of the head block 47 constitutes a first closed space 57a. Sensors are disposed within or through the lid or the valve to sense the position of the piston.