Stopper Won't stay in sink

Ben
by Ben
I have one of those bathroom sinks where you pull the back stopper and it pulls the plug down to stopper the drain. After a nasty clog, (which It took me about 45 minutes-1 hour to plunger out) the plug no longer stays propped up, no matter how i have the back stopper. I looked in with a flash light and the little hook that should hold it up is gone...
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