Wee update for you. Put new cables on today and now no cruise control
anymore. Throttle just snaps back. But something I noticed and mentioned before. In your pic the cables seem to be under tension , so I set mine up with no free play at carbs especially on pull side, and guess what , the throttle stuck open
and as soon as I put in a bit of play , it just sprung back. Confused me as it makes sense cables tight at carbs but not overtight , but a small bit of play and all good. By small bit of play I mean is that adjusters can move , half turn on lock nuts, they'll still hold in place but have a bit of movement in them .