Since I previosuly owned a 955i ST, I did compare the two adjusters. I agree that the older adjuster is better made.
I am going to modify my GT wrench in the following manner....
The first is to weld the handle to the tool. Then, I am going to weld washes to the side of the spanner. Braze is more correct.
After observing how this tool slips off, it appears to slip off to the side. By adding "thickness" to the wrench, this will push against the sprocket and at least hold the gadget on the sprocket.
Yes, I have the pinch bolt full loose. With 400 miles only, this area is very clean. I am not anticipating many chain adjustments, but when I have to do one, I want it to be easy to do.........J