Chicken.
Last time I cross threaded one and finally got Lyman to respond to my order I ended up with half dozen nuts, half a dozen rubber orings of every kind, and a dozen of those blasted links that bust sometimes when I get overzealous on big bore stuff......I think it cost all of $20 but it took me six weeks to finally GET IT. Meanwhile my sizer was down but I fixed that...........with another used sizer....