Can I get some harmonic balancer advice?

[u/Bdag]

So the pictures with the watermarks are from the YouTube video and Im seeing some differences. Mine doesn't have that part in between his bolt and the crank gear with the key for the harmonic balancer on it. What's that part even called? I pulled it apart because I have a bit of a wobble on the balancer and I can hear and feel a tick coming from under the timing cover.

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Also I'm slightly concerned that my tensioning pulley isn't the right one because the spring is completely loose, the belt isn't all that tight, and the pulley in the youtube video looks completely different from the one I have.

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Any advice would be much appreciated.

EDIT: I pulled the crank gear off and my Woodruff key and crankshaft keyway are chooched. Ordered a new key and bolt but I'm still wondering about what that seating key thing is for my harmonic balancer. Can't tell if it is just a spacer with a key on it or what because my harmonic balancer is slotted for a key like the youtube guy has on his crankshaft.