+ multmatrix([[1,0,0,0],
+ [-1,1,0,0],
+ [0,0,1,0],
+ [0,0,0,1]])
+ square([thick, tab_sz + circle_outer_rad + thick]);
+}
+
+module Hook(){
+ difference(){
+ linear_extrude(height=width) Plan();
+ if (false)
+ translate([-50, circle_outer_rad + tab_sz - width/2, width/2])
+ rotate([0,90,0])
+ cylinder(r= screw_hole_dia / 2, h=100, $fn=50);
+ }