Press it out. The o-ring and friction are holding it in. Clean the hole and lubricate the new o-ring when you reinstall the new part.
. . .
The black plastic nut retainer ( it just keeps the nut from turning) is held on to the housing with double sided sticky tape. You will have to remove the coating from the new plastic nut retainer.
Hope that helps.
Hell, *yes*, it helps! Thanks! It took about half an ounce of pressure "press" it out. The little wifey had to ask what I was cracking up about when it popped out so easily. :-) She might even get her kitchen counter back if I can figger out how to remove that "coating". Probably wouldn't have thought about greasing that o-ring, neither. . .