I have the 18" Fiskars reel mower, about a year old. One knife makes contact with the bed in about a 2" section. None of the other knives make contact and the mower cuts well, except it is hard to push and gets hung sometimes because of the one knife making contact. I assume it must have gotten bent, although no damage is visible when I look at it. Can this be repaired or do I need to buy a whole new reel blade. I would think that adjusting would not help since only one knife is making contact. What's the best course of action?