I also saw few of them bent when they where inside, decided to change all of them (I bought new set),and when I pulled them out (bit tricky with rotor in, but possible),alomost every one was partially bent somwhere. With rotor in you just can't see everything. With new vanes I got new bolts, and installed them also, cannot imagine what would happen if vane would brake loose during work, even don't want to think about it... Position of vanes if important too, but I set mine in mid position, for corn and bean (std. rotor).