The locknut was seized because the screwthreads were badly damaged preventing the removal of the lock nut.
While still in position the nut was firstly machined then split in two and removed. Then a new thread was recut in situ to accept a newly manufactured lock nut.
A dummy shaft was manufactured at 300mm diameter with a 6mm thread pitch. The orbital lathe would follow this pitch to recut the new screwthread to depth.
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