04871 Clamp ring LOGO 690 SX

I put it on my 550SE that I am running on 10S. Just for safety. Know of a friend that had a failure with the single bolt collar. After a minor turnover with the singe bolt collar on my bird I had shaft migration. The crash was do to a defective flybarless unit not a Mikado V bar. It went into a uncommanded roll a few feet off the pad.