mirror([1,0,0]) SHookL();
}
+module THookR(){ ////toplevel
+ mirror([1,0,0]) THookL();
+}
+
module Demo(){ ////toplevel
translate([-30,tubeheight,0]) HookL();
translate([ 0,tubeheight,0]) HookR();
translate([ 30, 0,0]) SHookL();
translate([ 60, 0,0]) SHookR();
+ translate([ 90, 0,0]) THookL();
+ translate([120, 0,0]) THookR();
}