I took the blades off of my RCK54 deck to sharpen them. Each one has 2 conical washers and one hex ID washer. To me it seems like that's 1 more conical washer than there should be. On 2 of the blades they were stacked and oriented like they should be with a single washer. On the other one they were facing, keeping the bolt tight for quite a few threads. What is correct?