Follow the steps from the below photos and you will find out why not and how i made it in the end.
Clean the aluminium foil using hand sanitizer wipes.
After making a hole, but not to big and cut the foil in this way, insert it in your bicycle light (the part that goes in your light holder).
Make a knot but not tight.
By this time i asked my brother "Why so many photos" and he said "This matters", in our mother language.
With two fingers i hold the other two diagonal pieces and let my brother make a knot, but again not tight.
By hitting the rocks (on the left, in the videos) the foil begun to break.
I had a piece of a foam roll made for wrapping from a package.
I used that and was fine.
You may want to hold it and ask again your brother to make a knot again. Don't have relatives ? You can do it yourself by hold your RC with your legs and than making a knot.
Done. I doubt that you didn't see the videos first :)