thumbrecess_width = 16.5;
thumbrecess_topcurve_r = 5.0;
-catch_slop = -0.75;
-
-catch_len = 4.5;
-catch_thickness = 1.3;
-
-catch_depth = 0.75;
-catch_height = 0.35;
-catch_finger_height = 1.5;
-catch_finger_depth = 2.5;
-catch_catch_slope = 2.00;
-catch_close_slope = 3.00;
-
prop_recess_under = 0.50;
prop_recess_slop = 0.200; // each side
prop_end_dia = 0.5;