Replacement encoder for Smart controller

Hi

The encoder switch on my RRD FGSC is a bit vague. It bounces around and jitters between values when operating it.

Is there a particular spec. encoder I should replace it with? I couldn't find exact details of the one used.

Would one of these drop in its place;

ebay cheap

Are the pin positions standard?

Can anyone recommend a better quality item to use?

There's this one;

ebay dear

Thanks

Alan