Guys, I totally missed the fact that the hole would be covered by the stock anyhow. Hopefully, that is true for the Charger as well.
I have a little brass thing that has a cone shape and goes on the cleaning rod. You push it up against the crown, which protects the crown somewhat. I don't know what they call it.
Incidentally, this is just a small portion of the information that is contained in the ebook, which I bought. He has several other ideas that I haven't seen posted elsewhere. Although I'm basically cheap, I thought the information was well worth the 12 dollars.
What I didn't like is that I had to pay for it via Paypal, which I'm not too fond of using. (I use Prudential Financial Master Card, which allows you to generate a new card number, date the card expires, and maximum amount for the purchase, for each online purchase).