The SCTA Rule Book (I think) requires two springs.
Which brings me to one of my (too often) tales in Inspection.
This one includes a very-experienced well-known old codger (even older than I, I think) who approached the Roadster and said something along the lines of "Well, this isn't going to go good. You've got your lug nuts on backwards."
I replied that they were tapered on both sides so I wouldn't and couldn't have done that.
He looked in the interior and asked "Is this a new car?" I guess I should have taken that as a compliment, but replied, pointing to the 6 or 8 red record plaques, "No."
Being right next to the Registration line, we were now drawing a small group of onlookers.
Then – "Push the throttle all the way to the floor – now let it loose." I did. He said, "That sounds like two springs."
"No, that sounds like three springs."