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The purpose is to put some wax on the inside of the case, since this is the surface that rubs against the expander. The amount is so small that it will probably have no effect on performance. I'd like to add that after my initial post, it appeared that the substitution of car wax/polish delayed, but did not completely eliminate the problem. I have added a supplementary soak of cleaned cases in another bath of the diluted polish (same as for cleaning), followed by draining (using the squirrel cage), and then drying on a bath towel without a water rinse. This increases the amount of wax and seems to have solved the problem.
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