I believe a fellow from Texas had a mirror with that defect. However, I have now traveled over 10,000 miles, and have dropped my RX3 three times. Yet my mirrors still remain in excellent condition.
You can purchase the stock mirrors for a very low price at Taobao.
However, I would claim new mirrors under warranty coverage.
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Spud
"Never argue with an idiot. He will drag you down to his level, and beat you with experience."
Mark Twain
2015 Zongshen ZS250GY-3 (RX3)
2006 Zongshen ZS200GY-2 (Sierra 200)
2005 Honda XR650L
2004 Honda CRF250X
1998 Kawasaki KDX220
Mods made to my Zongshen ZS200GY-2:
http://www.chinariders.net/showthread.php?t=6894