Most people I know use a wood board to clamp it. These boards are usually made of untreated birch, beech or basswood and are available on the european amazons.

http://www.amazon.it/Kesper-2012-2-Spianatoia-pasta-68x48/dp...

http://www.amazon.it/Asse-pasta-betulla-100x60x1-E2011/dp/B0...

http://www.amazon.de/Nudelbrett-aus-Birkenholz-100-E2011/dp/...

http://www.amazon.fr/Planche-pâtes-bouleau-100x60x1-E2011/dp...

http://www.amazon.co.uk/Beechwood-counter-board-100x60x1-2-E...