Not sure if this will help you, but I took these notes from a Field and Stream magazine on how to patch up cork handles
1. Sand a wine cork (220 thru 240 grit sand paper) to make a fine cork dust. About ½ teaspoon to fill 1 centimeter hole.
2. Mix powder and wood glue, enough to create smooth, dry consistency like cookie dough (should not be fluid like).
3. Use sharp pointed tool to clean out pitted areas. Fill them with the patch material. The filler will shrink when it dries, so repeat process to get the hole flush with the grip.
4. Once filler is drysand, wash, and then seal the cork.
Hope this helps.