Small Engines (Lawn Mowers, etc.): John Deere JX75, oil leaks, blowup

Question
I bought a JX 75 from a guy and he said he striped the bolt that holds the blade how do you take that off the mower there is a allen head but it is tight don't know if this is right thing to take off please help!

Answer
Looking at the parts blowup at JD parts online, it looks like the
center allen head holds the clutch on and the two outer ones hold the blade on, so take the two outer bolts off first.
   When working under the mower, take out the spark plug, and remove the air filter, so if any oil leaks, it won't ruin the filter.