I don't think my explaination helped! it's just a small piece that has a grub screw on, that appears to be part of the idle rocker arm on the pump itself. however its a seperate piece altogether (no idea why? maybe its some manufacturers have different cable types?) so chances are mine was a previous replacement as it looks nothing at all like the one i've found, however the one I have now looks like the servicebox images!
I've got pics below if they work properly! apologies for the mess, you don't notice the grot until you go digging around!
the offending area the old piece fell down. (a magnet probably won't help as its stuck between the block and mount for the pump)
this is what I was on about (note the moulded piece that the cable passes through with the screw on top, mine fell into the abyss!)
on the top right of this image (phone was at a funky angle!) you can see how close the cable comes to the idle screw, so to get a decent hold on the nut you need to get the cable out of the way
