As bespoke - I'm too silly to show here pictures. May be it's caused in my "Apple stuff".
I'll take some pictures the next days and with someones help we can show them here.
But it's also to do it with words. It looks a little bit like a child would draw a house. It' a symetric five-corner piece of material of your wish. I use a motorbike inner tube. If you've got a bicycle tube, use a big one like the modern big tires for MTBs.
So the construction in words:
The base is about 150mm. At each end you turn up in a right angle for 40mm.
So far, so clear, so easy.
From the middle of the base you turn straight up for 110mm. From this highest point draw a line straight to the right and the left point. When you're finished and think: "ah, it lools really like a (symetric) house" - You' ve got it.
After this hard construction you wrap it around the lower spring, "the roof down" towards the brakedisc. Keep the
openend showing to the rear and fix it with straps.
If there is someone a fast DIY-constructor, may his picturs would be faster ;-)
René