I had thought I had tuned out a slight left turn with the VG on. After fiddling a few times with the right outer sprog, it seemd more or less OK - maybe a touch too much, seemed to turn right slightly now. Rigging in the garden after replacing my bent upright, I pulled the VG on and sighted the trailing edge. Wow, that right sprog was lifting the edge over a cm. It was a disturbingly asymetric sight.

Next rigging, I check the tip wand socket. Left side, centred on the mid point mark. Right side, rotated backward (down) 1cm... so just the opposite of the sprog adjustment. Hmmm.

Email Moyes to ask if all of this makes sense. Few days later I get an email that "looks like I feel the need to tune my glider". Sure. I guess it's probably not realistic to expect much sense over the internet from halfway round the world (or 100km for that matter). So I've adjusted the tip wand socket back and rewound the sprog back in (lowered it) half a turn (it was 5/4ths). We'll see. I bet after I've finished with this the sprog will be back where I started and the tip wand socket balanced with the one on the left.

If so, why was it rotated back? Someone's perception of a spiralling right turn? No hint of that so far. 

9:42:56 PM