Don't forget to take the glaze off the metal surfaces that make contact with the new disc, when rebuilding,using some 80 grit wet sandpaper on a piece of glass will work fine on the cast piece,but on the thinner backup plate you should check it for flatness on a piece of glass,I had a friend resurface a few of them on a lathe that were not,but if it is still flat,80 grit also will work.
Did your kit come with instructions?
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