I need to replace a faulty brass screw down stopcock as the internals are goosed because of over tightening it is in a difficult location low down at floor level behind kitchen units it would be much easier for me if i could replace it with a pegular 1/4 turn ball valve or a sure stop type valve i know some will say put the ball valve after the brass screw down valve but if i did that i would still have to work the brass screw down valve now and again to stop it seizing up any advice would be appreciated ?