1999 BMW e39 528it bleed screw failure not headgasket or heater valve

so far so good a $5-$10 brass bleed screw to replace the worn out plastic bleed screw for the radiator hose... if u saw my other youtube ,,i had a irrigation fountain going ,, n no heat,, i got lucky it was just a 216k mile worn out bleed screw.. i read that ideally u want to use plastic not brass as the brass heats up expands n widens the plastic hose n will leak the hose.. so will buy a plastic bleed screw next... now to flush the radiator fluid..heaters blow hot as b4 and no head gasket failure or heater valve failure..the old plastic bleed screw wore out the rubber gasket ring and the slotted head,,,