Gottlieb D-6031 Lockdown Bar w/ Threaded Studs – Used. This lockdown bar was used on the first metal rail single player game, Flipper, in 1930 until Rack-A-Ball in 1962. A very uncommon and difficult bar to locate these days. The stainless steel portion is decent, however, everything else with this bar is VERY ROUGH!!! The end caps are severely pitted. The underside is very rusty as are the threaded studs. We have tried to describe this bar as best as we can, because it is NOT RETURNABLE.