Honda HRS536C Owner's Manual page 42

7. MAINTENANCE
If you don't have a torque wrench, have an authorized Honda
servicing dealer tighten the blade bolts before you use the mower. If
the blade bolts are overtightened, they could break. If the blade bolts
are not tightened enough, they could loosen or come out. In either
case, it would be possible for the blade to fly off while you are
operating the mower.
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