Please help me with ride on mower steering? westwood laser?

After a very small bump in the garden my mower no longer steers to the right, its fine if I want to go left or straight on. I have read some other advice online and looked at the cog attached to the bottom of the steering wheel and the cog that goes round it. I undid the stick that joins the wheel to the cog but if I move the wheels totally towards the left and then move the cogs totally towards the left the joining steering stick thing seems to be too short to reattach to the wheel. I seem to be going round in circles lol. Any instructions gratefully received but very basic and step by step please.

Buster
June 2009