I was just browsing on MBS just a couple minutes ago. And I saw these http://www.mybadmintonstore.com/sho...ucts_id=380&osCsid=n3jrsfdi760go0pnrniblk27r0 If anyone has tried them please let us know about this product!
1) what make and model of your racquet do you have? Yonex MP line has better design build in the frame already. 2) how often do you break your string and how? if your string break on miss hit, the device will not work. if your string break because of wear, don't waste the money. you got your money worth already. 3) do you string your own racquet? if so, it is pain in the @ss to put on during stringing. if you have one of the racquet that has no MP grommet and you want to make your racquet little more head heavy, it is a good idea. it suppose to make your smash more powerful. however, is due to head heavier or the proctor, i think both.
Seems fun to play with! Just be aware that you'll change the balance of your racquet. If you have an old racuet, it's worthwhile to put these for the first 8 mains.