Screwdriver
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My advice from thirty years of being machine rebuilder.
Level bed for twist
Remove suspect gap piece and clean all faces. Seating accuracy can be affected by corrosion and being refitted on a machine with twisted bed.
Align gap with dti preferably with clock on fixture running on tailstock ways if still good
Check headstock to toolpath using test bar( I have one you can borrow)
Check headstock to tailstock ways which should have less wear as you want headstock aligned not cockled to a worn bed
Minor adjustments to headstock if necessary
Set tailstock to mandrel test bar and perform between centres machining test
but accept it’s a elderly machine and hand finishing will be necessary occasionally
Ignore what I’ve said and listen to shed tinkerer or a youtuber
Out of interest, what sort of costs are (or were) involved? Can older, worn machines be brought back into useable condition cost effectively?