In fall '10, my binocular lost an eyepiece. Not just the rubber cup, but the entire screw-on ring. I searched high/low for a solution - these are Sigma glasses, seemingly a low-cost Zeiss "generic" - couldn't find anything on the net. I eventually called Zeiss, they referred me to this company:
These guys hooked me up with a new ring, with two new matching eyecups. I was almost at the point of tossing these things I looked so long. Now, color me happy!!
Not associated in any way, just a happy customer with repaired "go-to" binocular.