Hi Recently i acquired a Cab21 SP. While playing with it, i notice that it vibrates upon hitting the shuttle and i believe in the long run this will eventually causes injury. Is this normal in all CAB21 SP or is mine defect?
Well, as your MP55 lists in your profile, are you sure you aren't just used to the iso on the MP55 and just slow switching to non iso? I experienced the samething when I switched to a long racquet and non iso then it cracked and I had to go back and get used to that again. I would often hit off center and it would produce a vibration so I'd say you aren't hitting the sweet spot.
