Takes one of these to remove the splined retaining nut...
https://www.ebay.com/itm/402071140754?hash=item5d9d4eb992:g:qKoAAOSw3a9jI3lQ&amdata=enc%3AAQAHAAAA0OwwPAO5QjeegPLFzxnwD9IGLGYxkH7bArOCzizqIHgPvI%2BC3Z%2BacE4MVIJZwkF3aZ%2BIna5meTMSXVMp81NfYq9LqNaV%2BdRdp9eECmlXhCpKT2RymnMhf9WHvMoRe812r6MJ8IG20JaL4i5WjS0tSR9TE%2FgypOjY6Vr996B24fpOS2hyvrRcA4dE7S2XfQELefIgshTxugxm%2FSabpjXaHAsFXPMylyrsOfbSFWf1tffQRIkHo1L%2BfW5hUeFQIU2ouNo6bEa0wa9h555clB0NcE0%3D%7Ctkp%3ABFBM1ujn0fBg