wall = 1.5;
ring_h = 12; // the height of the body
-ring_d = 34.3 + 0.5; // the lens ring diameter + tolerance
+ring_d = 34.3 + 1.0; // the lens ring diameter + tolerance
-clip_h = 7.3 + 0.5; // height of the clip above the diaphragm
+clip_h = 7.3 + 1.0; // height of the clip above the diaphragm
clip_dist = 1.5;
clip_size = 1.2;