New answers tagged diy
You could buy a replacement from UK Digital or Samyang (these seem to be the same product for the same price). If ordering from the UK isn't convenient, you could find someone with a 3D printer and print one of these:
Until you find a proper one, I would simply fashion one out of some cardboard and gaffer tape. Or if you happen to find some plastic drain pipe of the correct diameter, you could use that.
Top 50 recent answers are included