The accuracy of results of client-side determinations used for defining views of a virtual space may be verified via crowd-sourcing. A third piece of page data is generated from the first and at least one second piece of page data, and a third piece of transform coefficient data is generated from the first and at least one second piece of transform coefficient data using a weighted addition. The bearing is positioned within the housing and configured to receive a rotatable component of the rock drill. These tubes also have good resistance to engine lubricating oils as well as fuels. An operating member is movably attached to the second sidewall of the bracket and connectable to the fastener. The clip is slidable between a locked position such that a portion of the locking clip is positioned vertically over and spaced from the rear shelf support, and an unlocked position providing vertical clearance to the rear shelf support.