Please see my recent post (by Jimirak). I have one such cord which is dual and appears to be spoken for but I have two single Ike cords with a Nikonos connector which is available right now. They retail for $100 US and I am selling them for $60. Mint condition.
Thanks to each of you for your suggestions. Sorry I am late with this reply.
I was able to remove the little "mark" on the Aquatica mini dome port by just using Novus plastic polish. The first thing I did was to mask around the affected area using masking tape. Then with a soft cloth and the intermediate Novus polish (red lettering on the bottle) I rubbed vigorously. Two fine scratches disappeared immediately and then the "mark" later disappeared as well. I finished up with the fine polish (green lettering bottle). So we know that this Aquatica dome is not coated on the outside.
Recently in Palau, a friend put a ding in his aquatica mini dome port as well. It took more rubbing, we did not mask, but eventually we did get the deeper ding to be almost gone. He was shooting only video and checked it out and it did not show up in the videos. I think with a little more work I could have got the ding to be completely gone.
So there is hope for glass dome dings if the ding is not too bad.