The change between feather and nylon shuttles does not change the skill level of a player using them. If it's this one weakness they have, maybe they are playing with feather birds that are too slow? You are not capable of striking a feather bird with any more force than a nylon.
can't understand much of what u r trying to say. on the part of having a gun advantage. US has the biggest gun and yet they still can't catch O. bin laden nor crushing the tribesman taliban.
