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peter_v
@fredtc
This looks like a (not cheap) possible solution
https://www.bikingbarn.co.uk/mavic-id360-bearing-tool-V2550201
The ID360 looks like the freehub has a similar lockring retaining the bearing
You might get lucky with a file and one of these https://www.ebay.co.uk/itm/285455449198
A cheap pin spanner might even be enough if the pins are long enough