Well, I think I will have to buy a new one, saw one on a second hand site in NL for 8 euro excl. shipping. Probably soon after arriving the new one, I am going to find the other one
It's just so damn annoying that I loose these kind of things. I have occupied a dedicated part of a closet to store all my bags, lenses, batteries etc. but still losing things (that should have been ON the lens in the first place).