Hi. Is there such a thing as a manufacturer of universal rubber caps for spotting scope oculars? I lost the cap for my Nikon ED50 (MC 27x) eyepiece and would like to replace it. It doesn't seem easy (or possible?) to replace it with an original part, but I could easily settle for something similar (with similar dimensions). After googling around for a while, however, I have come up with nothing. Any advice on how to protect my eyepiece would be appreciated. Thanks.