Just need to find a longer front break nut now
Ah the search for the elusive Cannondale front brake nut.
Medium ultegra 6800 nut works in my premium slice fork.
You are right that shimano nuts work fine on Premium+, I use one on my R900 with P+ and 7800 calliper. They don't work nearly as well on System Six forks unfortunately. I went through the same process a couple of months ago building mine.
@Howard started
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Just need to find a longer front break nut now