My RDX 500 mid has this problem at 6 o'clock. The inner grommets were cracked during first play! I sent the complaint to both Yonex Thailand and Headquater. Yonex Thailand just informed that they have no spares Without any useful information. For the headquater, just only one reply that they sent back to me on June 2. I already sent back some information they asked on that day. Please let me know what should i do? Purchasing from TW may be the last choise. Thank You.