Puzzle: Seven nails balancing

This deceptively simple puzzle consists of a block of wood and seven nails.

The setup is simple: The block is placed on its side with the small nail hole on top. One of the nails is inserted into the hole until it goes down as far as it will go.

Now comes the hard part. Balance the six remaining nails on top of the head of the first nail.

No, I'm afraid that's a non starter.

If you want to see the solution, scroll down...

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