I just switched bike to disc-breaks and got a zipp super-9 race wheel.
When installing the caps for the through-axle, the cassette side is fine but the break side is wider and I can't fit the cassette tool on it to tighten. I'm using a tool similar to park FR5.2, but it only slides in a few mm before hitting the "fat" cap and not reaching the grooves.
Interestingly enough, had no issue with the 404

Is there a special tool for this? where do i get it? Am I doing something wrong?

thanks