North Star 49157 Owner's Manual page 16

See Figure 5.
8. Replace the Blade Holder Outer (09) and Nut (06).
9. Tighten Nut (06) to approximately 45-50 ft. lb. (61-68 N/m).
Figure 5
10. Replace the blade cover and hose by performing steps 1 – 4 in reverse order.
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