I'll keep an eye out for the retainer but that may be like trying to find a unicorn.
The one I have is the ready to fly Cox version I bought about 20 years ago. It was very difficult to load the chute and on the 3 flights it made the chute only fully deployed once. The other two flights, it hung up after popping the nc;, smacking the ground like a mortar but with NO damage.
It flew beautifully and looked great but after 3 flights I decided we wouldn't fly it again. It is risky at best. Wear a helmet and shoulder pads.
About 10 years ago Estes recalled their X-15 which means you can't fly it at a NAR sanctioned launch. Of course you could fly it on your own.
Here's the info on recall:
1. X-15 RTF Flying Model Rocket Model #1890
2. X-15 RTF Flying Model Rocket Starter Set Model #1412
I'm sure if you Google it there's additional info.
Randy
http://www.vernarockets.com
http://www.amazon.com/dp/B00HHJHOK6
http://www.amazon.com/dp/B00O14ET8K
http://www.amazon.com/dp/B01CX1UPCG
https://www.amazon.com/dp/B07C95BNQH