I think I'm missing a nut.

Swinger 340 said

I was waiting for someone to call it a bolt. LOL I'm not familiar with a 225 or any other 6 banger but what keeps the balancer from flying off without the bolt? I would think you would need the bolt to install it but why then would you remove the bolt afterward?

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It's a press-fit, the hub of the damper is supposed to be warmed-up, then pressed on with an installer. Once it's on there, it ain't comin' off, the tight press-fit will better transfer crank harmonics to the damper. While it's not needed, the bolt does make it nice to turn the engine over.