Just fit the threared headset nut further down the steerer than you are cutting, then just mark with a bit of tape, so you cut straight, or I use a 4 1/2 grinder with the very thin cuttuing discs. Then just wind the nut off to clean the threads, a quick file and sorted.
Just fit the threared headset nut further down the steerer than you are cutting, then just mark with a bit of tape, so you cut straight, or I use a 4 1/2 grinder with the very thin cuttuing discs. Then just wind the nut off to clean the threads, a quick file and sorted.