Because the spring has a smaller diameter than seatpost inside, as supplied with medium-hard spring a spacer sleeve is mounted, which then prevents buckling in the middle of spring. Thus, this sleeve remains in the center of the spring, it is fixed by a shrink sleeve in position. With the change to the harder spring this goes kapuut and sits afterwards nucht as firm in the spring as the Original.Und who has already matching heat shrink tubing and a heat gun at home ... So I have to cut the tubing shrunk - but if that keeps on time after the onset of hard spring ??? Therefore: Function 5 star - Conversion 1 star - average just 3 ... Delivery by the seller but was ok.
