Harmonic balancer comes off

Exactly. The bolt doesn't hold the damper on, press fit does. You should have had to use a tool to install it, unless you used the BFH method, which I know is popular in some circles.

If it was loose for very long, chance are you will need a new crank. Or, you can have the snout welded up and sized to spec. But that is probably more than a new crank.

Bummer.
The bolt dosnt hold the balancer on? I had a thread about putting the sucker on around Thanksgiving last year where I was trying to put it in the oven while my wife was cooking to heat it up LOL then of course the forum bitched me out for doing that let alone my wife she said- now where are you going with that thing and why are you opening up my oven? But it's just shade tree garage mechanic kind of stuff that I shouldn't have been doing in the first place obviously.