The first sign of madness is beieving that the inside of your concertina is hairy.

The second sign is opening it up to check.

For Guest, John, an encouraging word - there is only one right way to put a concertina back together, and that's to avoid the thirty-five wrong ways.

Actually, that figure is only for when you've taken one end off a six-sided concertina to examine the hairiness or otherwise of the bellows. For each additional disassembly stage, the figure should be multiplied by six (at least).

Ross