I will try to help you, unfortunately I have issues in uploading pictures.
You need:
2 times 1 meter elastic 4 mm diameter
1 time thin line (could by nylon or what ever 2mm diameter) 2,5 m long
The thin line is fixed on the upper mast part on this small item which is there to save the halyard. You fix it with a simple not in the middle of the line. at the two ends of the thin line you put the two elastics.
Then you put one elastic on the upper block of the cunningham and the other on the block on the outhaul. You could either make a knot, I am using a 4 mm thick short soft shakel, which makes it easier.
Best regards
Michael