Abstract: Various battery packs are presented for use with twenty volt (20 V) power tools. In some embodiments, one or more lithium-ion battery cells of the battery packs are received by a handle of the power tool.

Abstract: An improved device for fixing the strings of an acoustical stringed instrument including a generally rectangular block, preferably composed of a metal such as aluminum or bronze, having a bottom surface, upwardly extending wall surfaces and a top surface. The block is provided with a bore extending from the block's top surface to the bottom surface. The bore is in a generally normal relation to the block's top surface and is provided with a notch extending from the top surface to the bottom surface of the block. The block's bottom surface, in addition, is provided with a generally circular depression centered approximately over the mid-point of the notch opening at the bottom surface.The block is positioned in the interior of an acoustical stringed instrument so that the bore is operatively aligned beneath the opening in the bridge of the instrument designed to receive the end of a string having a restraining means at the string's terminus.