Here is a handy machine that lets you prepare patties like a pro. The Hamburger Press / Patty Molding Machine is made of die-cast aluminum. It has molds and knock-out discs, allowing you to make 1/6 and 1/4 lb. burgers. It holds up to 100 sheets of wax paper.
The device is a convenient handle to make it easier to form patties. More info is available here.