So this is one of those old fasioned drain stoppers attached to a lever on the overflow plate? Did you take that plate off? You should be able to see the end of the linkage and grab it. If it's lower it might take a needle nose plier or vice grip. I also find a mosquito hemostat is good for this kind of work. If it's really deep, dental mirror, fiber optic flashlignt and cleverly bent coat hanger. Also good for this is one of those "grabbers" they sell at the auto parts store for retrieving head bolts you drop into engine cylinders. Richard
remove the lever cover and go fishing with a dollar store grabber with a t plunger handle and springy prong minifingers or maybe dollar store magnet. automotive supply item. keep it by the clothes dryer to retrieve the dropped socks. sometimes these are in a two-pack where you get one of each. a sewer snake with a curly pigtail end that might curl around it.
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