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Put your finger down lightly and rub quickly but gently in a circular motion, and lift the rag off the surface before you stop. Keep away from the decals--concentrate on the black. (If the decals are in bad shape or gone, this matters less). Recharge the rag with alcohol and oil regularly. Turn the machine around to get to other areas. Rub quickly, but take plenty of time--this is a slow process. You can work a while, then go back to it later. Don't use too much alcohol, it is possible to remove all of the shellac, and you don't want to do that. For checked/alligatored areas, go heavier on the linseed oil. It will build up a shine, although some imperfections in the finish will still be visible. After a while you may develop a feel for how it's doing (another reason to start on a junker instead of a machine you care about). Keep going until you are satisfied with the looks, remembering this will produce a serviceable working machine, not necessarily a museum piece.
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