So, how did you fare? What were the total 'damages' when the dust settled?
I just joined the 'club' yesterday. Exact, identical mower. I installed an hour-meter on it the day it was delivered, and it's at 85 operating hours. Nailed a large tool in deep grass.
The vibration isn't bad at all (and in fact might be no worse than before the incident -- could be my expectations / concerns as much as actual vibration). Nice bite out of the blades, but not as bad as I anticipated.
The indicator of a problem is the new whine from the engine, even with the blade disengaged. The whine really sounds like it's in the recoil area, and I'm guessing it's the flywheel lightly contacting the magneto and/or brake. I managed to finish up the mowing -- maybe 40 minutes worth -- and under load, it's hard to tell there's anything wrong. That whine, though, is too loud to be healthy.
My initial plan here is to R/R the crank. I have the Honda shop manual, and it's not terribly clear about setting the valve timing, but I think I can muddle my way through. I'm guessing two half-days of work and probably $100 in parts -- not exactly what I had in mind for my summer leisure time!
I'll let you guys know how this works out.