Rudder Pedals.

Here are the rudder pedals that I bought off eBay for £23.25 with P&P. They have hydraulic arms for the toe breaks already fitted, So I need to somehow make the actual rudders go backwards and forwards. I was thinking maybe a small shock absorber of something like a minimoto, or some other sort of spring. I was going to use some exercise machine dampers.. But I decided that they were to strong to push against for rudder pedals, and they didn't give the necessary spring backwards.