Are the U-shaped grommets from here durable? (would it crack easily if I mishit sometimes?) http://www.mybadmintonstore.com/shop/product_info.php?products_id=241 ALSO, I was thinking for taking out all the regular circular single grommets on my Yonex VT-60 out and replace with those generic U-shaped grommets from MyBadmintonStore. What factors would affect the racket if all the grommets are U-shaped? (I was thinking maybe the racket should be more powerful since have a racket with ALL U-shaped grommets should give that YONEX MusclePower strip affect by having all the strings in an "Arc" position. Last question would be I just bought some Hi-Qua Grommet protection pads for my ArcSaber 5DX (strung with BG-66 Ultimax at 26lbs) Should I install the Hi-Qua Grommet pads on all the paired grommets? If not, which position should I install it? Also, after installing the Hi-Qua Grommet pads, what factors would my racket change? (I know the weight balance will change a little, but since the Arc 5DX is only a little head heavy, I don't think it will make much different. Also the Arc 5DX's -DX FRAME is already pretty thick, I don't think it will cause too much air drag. I could be wrong though, please let me know) Please let me know, thanks.