I have x300 and I can't seem to get the deck level. The left side blade appears to be cutting about 1/4 to 1/2 in lower in the center than the right side blade. I have replaced the left side spindle and still have the same problem. Is it possible to shim the left spindle using washers on the spindle between th deck and the spindle mount to correct this issue? I believe the deck may have been bent in the past by striking something or going over a stump. Any info appreciated.