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Center arbor on 48" two bolt deck

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I have a 48" deck. The center arbor went out last summer and when I went to replace it, the shaft was welded fast. I just got around to getting the parts to fix it and I ground off the weld and started to put everything back together. The parts breakdown shows a small washer, then a big washer on the bottom side of the bearings, and at top it shows two small and then the large washer. when I put everything together according to the parts breakdown and put the top pulley on, the top pulley covers the shaft threads. Is the nut supposed to go on top of this pulley or inside it? It will fit inside, but it doesnt seem like the three allen bolts would be enough to hold everything together. If anyone has one of these older decks (man. # 886) could you look and see how yours is? I cant figure out what I am putting together wrong. I bought the tube assembly as one piece. It should go together fairly easily. ddh

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