That's interesting Kiran, I also made a feeder which uses the same principle, but although it worked perfectly, the hens decided they preferred pecking at the trigger to actually eating the food that fell down, so I had to abandon it in the end because it actually increased waste.
BML - our hens also used to flip food everywhere from a standard feeder, so I laced copper wire to achieve the same effect as the 'anti-waste ring' on this feeder, and that solved the problem: