@134318c2 

Where on this diagram are the threads ruined & what material are they?

And no, you are not nuts; plumbers are expensive and this work is usually less complex than drywall or electrical.

https://files.sfba.social/media_attachments/files/111/066/742/119/412/859/original/688eafae277d6468.png 

 @bb1c524f 

It's not on that diagram it's the basket at the bottom of the sink. But I think I see how to remove it and am checking if it's one of the standard sizes.