I have a 60" three blade deck. One of the outboard blades is 1/4" higher than the other two blades. The spindle is solid and has no verticle play or bearing slop. The offending blade is level, just 1/4" higher. Any suggestions on what I can do to cure this? I consider using a washer to lower the blade, but the dealer recommended against that as it would not be OEM. Opinions?