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Nut for center bolt for F2, F6, F7, F8, F9, F10, F11, F12, F13, F50, F51, F100 (2-9)

Picture of  2-9
Did you let the locking segment stay loose too long? That’s how you lose the lock nut. Don’t freak out - buy a new nut and save your trusty tool. Made in Switzerland.