Does anyone know what the point of this is on the John Deere Standers? http://www.greenfarmparts.com/John-Deere-Deflector-M134305-p/m134305.htm Called a "Deflector" ? Two under my deck above the blades are falling down every time I remove the blades, while the other one stays in place. I've been hearing a kind of "whirling" sound when I disengage the blades. I've been suspecting spindles. After tinkering with it today with the engine and belt off since I had nothing better to do, there doesn't seem to be no play in the Spindles / Pulleys. I'm wondering if these loose deflectors could have something to do with this sound? Does anyone know what these are even used for? If I had to take a random guess? To protect the spindles? I figure these would be much cheaper to try and fix that noise first at $6.00 a piece, never hurts to start with the cheapest issue.