Search Youtube - @iamdub has thorougly laid it all out for you so not sure why you even need a video. What you need is a breaker bar, socket and perhaps an extension. Autozone, advance auto parts, oreillys etc should have these tools.I’m at work I kinda skimmed this… will come back to it. Is there any videos I could watch about this?
In the meantime, make the indexing mark then start it up then shut it off. If you either can see the mark but its displaced by say 90 degrees or cant see it all, indicating you rotated the engine ~180 degrees relative to where you started, you should be able to view your entire flex plate that way. Will take a few start/stops but you'll eventually get visibility to the entire flexplate and know if its cracked or not.
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