Give me your "How to Cut" method

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Since starting up smoking again I've been without a punch, so I've been using my fingernail to do what a punch would do.

I remember someone posting some photos of this method somewhere a few years ago.

Basically you use one of your fingernails to make an indention/cut in four lines to make a square. If you've done it well enough you should be able to peel away a section of the cap and begin