Someone probably said at some point: "steerer threads not rolled, but cut" and someone later when asked recalled back their brain associated "Steerer threads", "rolled", "cut", and "not". but got the order wrong. and now here we are. Its also very common for people to drop the negative when recalling, so that memory becomes "threads cut and rolled" as the "not" goes away.

that is why your mother recalls just how much you LOVED eggs as a child and tries to serve them to you, even though you have told her multiple times that you do NOT like eggs, and never have. All she remembers is associating you with eggs, your strong feelings for them, and how much she likes You.. so... you must like eggs!

anyway, maybe some are rolled, but if they are, its much in the minority to as not to be significant as far as I can tell.