Rotary dial...?

[tr1st3ss3du3r4.livejournal.com]

Hi, crafty people!

I work with young people with cerebral palsy, in Art sessions, so we do a lot of crafting! In one of our sessions, our guys have their own personal projects. Brilliantly, one of them has chosen Deal or No Deal, and he has set his sights on creating a Deal or No Deal phone (well, amongst other things - he's got some fantastic ideas!) So far we've managed to create the handset, and the phone base itself, but the rotary dial is causing a problem.

As such, I turn to you - any ideas for how to create a rotary dial, ideally in quite a simple (but effective!) manner? We only have an hour for sessions, so anything too complex could be a problem! At the moment we're leaning towards two discs held in place by a split-pin, but I thought I'd have a hunt and see if we could find anything better before putting the idea into motion!

Thank you :D