I don't like my mirror moving around when it gets bumped. This just in, I did find an early control with broken clutch adjuster threads, the pin pulled right out, it was obviously pressed in while the newer ones seem to be cast in place. It is loctited into the left side now.
Answered my own Q? but I'll leave it for reference Now to see how many old broken controls I can find, I have at least one more bike like this.