My previous design didn't work as expected, so I took up Bens_Basement's geometry and startet OpenSCAD, like ecloud did. This upload is meant to fit my CMI ZQ20002 hydraulic trolley floor jack. To get the geometry of Bens_Basement just enter: disc_dia = 50; disc_height = 15; disc_fil_low = 2; dimple_dia = 12; dimple_fil = 3; disc_fil_high = 1; trans_z = 6; square_x = 50; square_y = 29.5; square_z = 18; square_fil = 1;