अक्षेषु नान्दीपिनद्धं कारयेत् ॥ कZ_०२.१९.१६ ॥
akṣeṣu nāndīpinaddhaṃ kārayet
On the axle/pivot points, he should have a nāndī-fastening/binding made (i.e., a specified securing/locking arrangement on the pivots).
Because small mechanical looseness or hidden alterations at the pivot can systematically bias measurements; specifying a fastening standard reduces manipulation and wear-based drift.