INtegra kitchen draws latch mechanism replacement?

[Andy Peanuts]

The draw latch mechanism in the kitchen has completely disintegrated at the opening knob.
The shaft which I think inserted into a plastic square which then turned on operation and released all the catches on the draws. This has just broken. Has anyone experience of this and any solutions or replacement??

 

[Em and Tim]

Fixed the other end of the mechanism, but not the turning knob I'm afraid. Whatever you do to fix it, I'm sure it will be an improvement on the knob on ours!