Balancer slides in on install

A harmonic dampers job is to reduce harmonics. If it doesn't fit tight on the crankshaft it can't do it's job.

When you buy an ATI aftermarket damper it tells you in directions how much press fit the damper needs be it a steel or aluminum hub.

It also tells you to put the damper in hot/ boiling water to open up the clearance to make it easier to install.

Also a crankshaft bolt is only to keep it on the crank and in no way helps it fit tighter on the snout of the crankshaft.

Either the crank or the damper is bad and the engine will be short lived if you run it as is.

Tom