may you misunderstood... when you install the new crown on the stem... you need to screw it in strong on the stem... or the crown will not fit tight enough on the stem... but please don´t wind the crown tooooooo strong... some guys wind it like hell... but this crowns are very sensetive and the crown tube can break... the crown tube is very thinn (because the spring mechanism need to much room). On the genuine is the crown tube thicker and more stable. Also, the older T48 crowns are more stable because no spring mechanism and more stable crown tube. But the new spring loaded crowns are very sensetive with thinn crown tube... be careful!