We aim at a direct measurement of the compactness of three galaxy-scale lenses in massive clusters, testing the accuracy of the scaling laws that describe the members in strong lensing (SL) models of galaxy clusters. We selected the multiply imaged sources MACS J0416.1-2403 ID14 (z=3.221), MACS J0416.1-2403 ID16 (z=2.095), and... Show more