My Sawstop brake fired for the 2nd time since I've owned it.
The first time (2-3 years ago), it fired because it contacted the aluminum Incra miter gauge fence.
The second time (this weekend), it fired because...IT CONTACTED THE ALUMINUM INCRA MITER GAUGE! FENCE!
I thought I had learned my lesson, but apparently not. Changing the angle changes the distance of the fence to the blade.
Lesson learned: use a long, auxiliary fence so you can keep the metal part far away from the blade.
It's an expensive mistake to make, requiring both a new cartridge AND blade... (and underwear...)