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150's generally don't need a spark plug gap modification, as they have a better stator.
As far as gapping the spark plug, you don't need to break the center pin. You can bend the arm a bit, and if it's bent too much, bent it back with a screw driver without even touching the center pin.
The outside arm is fairly bendable, so it's not like you will break it anytime soon (unless you perhaps plan on bending it 90 degrees or more.
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