As already mentioned, you are best off to watch the numbers and the meter. Personally, the meter is too tricky for me to time properly, so I use the numbers to determine when to "Cock the Hammer". .
Hey Han, try to chuck the Hammer between the numbers of 1361 to 1366 on the number dial. It will only give you a modest throw, but with the proper angle it will get you qualified. Once you accomplish that, then you can shoot for the ultimate throw: between the numbers of 1489 to 1494!!
Try this Han, let me know if it helps!
MO