Abstract: Attachment ears for use with a predetermined assembly of Johansson blocks, with the ears disposed at opposite ends of the assembly, for measurement of an inclination between spaced-apart surfaces of a workpiece. An indicator gage has a stationary stylus to contact a surface of one ear, and an indicator stylus to contact the inclined surface of the other ear and moveable thereon to define an arc with the stationary stylus as a fulcrum to establish an apex reading of the indicator. The gage is transferred to the workpiece with the stationary stylus and the indicator stylus contacting the two spaced-apart surfaces, and the indicator gage is moved about to provide a gage reading to determine a thickness of material to be removed from the workpiece.