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Joined: Aug 2007
I have succesfully transplanted Woodstock, HP41, etc logos. First thing to do is get a corner of the logo lifted. Many logos will already have a loose corner where the person who installed it had touched the adhesive... almost always the right hand side. Otherwise use a razor blade/knife.
Next I take a strong piece of thread and wet it with a product called UnDu. It is just the solvent heptane (found in many rubber cement thinners... others are hexane). It causes adhesives to temporarily loose their stickiness. I also place a drop under the label corner. Then I use the thread like a cheese knife to slice under the label. Keep the tension on the thread towards the calculator and away from the label.
The label will probably curl. Place it on a piece of adhesive label peel-and-stick backing material. Fold the material over the label and smooth it down with the back of a spoon.
Many labels can be stuck back on directly. On others you can rejuvenate the stickiness by wiping them with 91% isopropyl alcohol. On others you will have to remove the old adhesive and stick them back down with a good spray glue like 3M Super77.