Abstract: A power source retention system including a power source having an outer casing and a locking member mounted on top of the outer casing for rotation about a vertical axis relative to the outer casing. A power source compartment is configured to removably receive the power source into a power-source-receiving space in a vertical direction. A retention member is located adjacent to the power-source-receiving space. The locking member is rotatable about the vertical axis in a locking direction. The locking member engages the retention member to block the power source from being upwardly removed from the power source compartment, and is rotatable in an opposite, unlocking direction about the vertical axis whereby the locking member is unengaged from the retention member to allow the power source to be upwardly removed from the power source compartment.

Abstract: A protective work surface cover including at least a first layer configured to attach to the work surface, at least a second layer removeably attached to the first layer configured to be removed once used, and at least a third layer removeably attached to the second layer configured to be removed once used.