These strainers are the most common type used in standard kitchen sinks. When the handle is rotated, the desired result is to either allow water to drain – or to use the strainer as a plug stop. A major flaw in this design is that most strainers fail to remain in the drain position due to the gravity pressure from the water above which creates quite a force. There is nothing to retain the stopper in the open position. The results are usually a sink full of soapy, yucky water with bits of celery floating on top..
Taking initiative to modify the design, I unscrewed the assembly, and discarded the rubber stopper and its zinc weight. I cut a piece of plastic from a joint compound lid, punched a small hole through it, and re-screwed it to the handle. After making this modification the strainer can only function in the drain position, which is suitable for my personal kitchen use.