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Now this is a little tricky, you need to let the Delta ball assembly go to put the nut back on (by the way I put a little plumbers grease on the threads inside the nut and on the faucet body) and the assembly likes to come up, and the tab comes out of the notch, then when you put the nut over it you can not see it any more. just push in back down from inside the hole in the top of the nut, if it turns when you tighten the nut the tab is not inside the notch, line it back up and press harder.