>remove calliper to put on next bike
>take it to work to remove oil/dirt inside with air compressor
>work on a different place than usual
>blow inside
>this air compressor has a much higher pressure
>piston comes out and hits the other one
>edge shattered
I just hope the big piston of the saint is the same one I have on an extra MT520 at home. If not I'll have to postpone the build for another 1-2 weeks till I get new pistons from chinkland.