Just now, i try one more time, to open the boot to lift up and down quickly for 3 to 4 times, it's still smooth. Best. Lazy to think of use of gease or other thing liao as WD40 can solve this annoying problem which just a simple spray! RM6.xx for small WD40, medium size is RM9.xx , I bot in Johor.
WD40, no dirt at all. Sui one.