Chosen Solution
There are no directions on how to do this
I’m not sure which lawn mower model you have, but you can check out page 19-21 of this Operator’s Manual PDF for Murray model 96012007200. Other Murray operator manuals also exist on that somewhat-spammy site, but unfortunately there’s no iFixit guides for them (yet!). Perhaps you can start a Murray repair guide for the drive belt when you perform your repair? :)
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