The invention relates to a method of retrofitting a single axis length measuring machine for calibration of micrometers to provide accurate measurement of objects, the length measuring machine comprising a base two heads, a micrometer head, a first stand to fix the micrometer for calibration, a plurality of poles to hold the machine, the method comprising the steps of providing a second stand configured with two sets of threaded holes, the first set of holes is used to fix the second stand on the machine, providing a dial indicator of least count one micron which is fitted on the second stand via the second set of holes locating a pulley formed of a ring with a bearing press-fitted, a groove configured on the outer surface of the ring to allow a string to be moved along the pulley, positioning a third stand such that a part of the stand can hold the pulley via an axle, the pulley having end weights to pull the second machine head connecting the axle with a shaft of the pulley via a third set of threaded holes, the part of the thirds stand being fixed to the stand through a fourth set of threaded holes wherein the sub-assembly of the third stand is fixed to the single axis length measuring machine through a fifth set of threaded holes using a plurality of screws.
