I think I posted a pic before I will have a look otherwise I can again. It is quite simple I will try describe them.
Method 1 is to disconnect the C pulley where it joins the rear main-pigtail and Z main, ie the rear of the mixer. You then connect the C pulley line as a larkshead onto a 8 knot made in the rear main. Like that it can also move connection to the rearmain/zmain join or the rearmain/rearline join so as to quickly adjust length.
Method 2 is to instead disconnect the Z main at the same spot and connect it to a pigtail. The pigtail can larkheads like in the previous method.
The disadvantage of Method 1 is when you adjust the Z length by moving the C pulley connection it also changes the trim. It is also a little hard to adjust the knot in the rear main.
Method 2 is a little less clean if you have a simple pigtail with a knot, but you can do other methods that are cleaner.
Armin Harich wrote:
It is important to measure with 5 Kg load. Otherwise you will set C and B main up to 5mm too long.
The reason is that the sparepartlines are more elastic due to less prestrech to decrease shrinkage while ruling over the pulleys.
great back and forth support from FS engineering, they do not recommend Z stretch as they quickly return to the shrunken state after a bit of use.
If for plain mixer test I have never used 5kg, and it has worked fine. 5mm is nothing. Older flysurfers are never correct with a level mixer unless recently restretched though. Restretch does work but doesn't last forever.
If you use 5kg for the long mixer test you will significantly stretch Z out (depending on condition) and that will in turn change your adjustments for B and C. Most likely far more than 5mm more like 20 to 50mm. A lot depends on how the kite is designed to work with shrink. But to measure shrink and so work with it you need to use as low a force as possible, well that is my belief and it seems correct.