At any rate, the missus seems to have something against the color red. Looks like I'll use a versa-ball instead.
i avoided the versa-ball, because it's 1/2" to 3/4" longer than the tornadoterry. i think this will have a negative impact on game play.
mcmaster-carr carries many types of ball knobs that fit. there are some example part numbers on the web page referenced in my signature. besides the bright red polypropylene, there is a shiny black phenolic, a red phenolic (which is a dark burgundy/maroon color), and a plain aluminum (which is very nice but only comes in 1" diameter, which is too small for my taste).