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@user74931
Ctc forum have quite a lot of information on the 'shimming' of shimano freehubs to remove the play. This post includes a diagram of the freehub internals.
https://forum.cyclinguk.org/viewtopic.php?f=5&t=145496
To get into the internals of the freehub to remove a shim you'll need a tool. Search freehub removal tool on eBay.
If you can't remove the play with cassette spacers I'd maybe look at this.