Would one of these work better?
http://www.landmsupply.com/department/farm/chicken-supplies/miller-little-giant-plastic-flip-top-feeder?utm_source=google&utm_medium=shopping&utm_campaign=google_base&gclid=CjwKCAjwhcjVBRBHEiwAoDe5x--DzrHBIHK9SgH_LVx7L93IX6aFb6vtUnFYrwVkn8IdfyPrUME_mxoCD_sQAvD_BwE