Why risk harsh solvents? I would simply scrub up the heel area of that stock with 0000 steel wool and low odor mineral spirits (mild) to clean and even the area, let dry 24 hrs., dab with a little stain if necessary, then rub on some varnish in thin coats with a cloth pad until it evens back up with the rest.
There is too much good finish on that stock to risk messing up.
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