As for the design it is simple. A straight metal rod (sariya) with a metal U welded on top. A little toweling wrapped on the U makes sure there is no damage to the rods (though I still have to get this done)
Rather than wrapping towelling arround the "U", another option is to take a length of tubeing that just fits over the metal and push it over the ends of the metal.
At first. the tube will stick up vertically, making the "U" into an "O", but put the rod on it and push it down and the tubing will form a liner, keeping the rod and the line away from the metal which may well have sharp edges.