Lens attachments for oval ports

I have a Canon A640 in the Canon housing which has an oval port making it unsuitable for Inon lenses. I sent Ed a question about his set-up (the G7 housing has an oval port as well) and he was kind enough to send me a link to another forum that detailed how to remedy this problem (again, thanks a lot Ed). In searching this forum, I found a link to a company that appears to have solved this problem with a 67mm lens adapter. While there are cheaper ways (like the one suggested by Ed) to get around this problem, this adapter seems like it is the easiest solution. Just thought I'd post this link in case anyone else has this problem. It says the adapter is for Epoque lenses but I can't imagine why it wouldn't work for Inon lenses as well.

ScubaCam.nl - THE underwater photo and video specialist