Patent ID: 7832112

Claim:
In a level including (a) an elongate hollow frame with two sidewalls and top and bottom walls extending therebetween, (b) a topnotch defined by the sidewalls and the top wall which have notch-defining edges including non-vertical surfaces, and (c) a vial within the topnotch, the improvement comprising a vial-mounting structure including: a vial-holding member resting directly on the outer periphery of the non-vertical notch-edge surfaces; and a locking member movably secured with respect to the vial-holding member and including frame-engaging portions which press upwardly against a frame inner surface to pull the vial-holding member downwardly against the non-vertical notch-edge surfaces, thereby securing the vial-holding member to the frame such that the vial-mounting structure is free from any engagement with the bottom wall.