HELP: Can't remove 16x9 HD45X-EXII fisheye from EX1r
 

I am in a fix this morning and was hoping someone can suggest a solution I am getting ready to do some filming in Big Bend National Park -- VERY remote -- and was going through my equipment. I haven't used my 16x9 fisheye lens since got it a long time ago and was trying it out. It attached easily, but now I can't figure out how to get the thing off! It doesn't rotate and appears to be locked on and I can't find a solution. I have used it once before, but don' remember doing anything unusual to get it off. It's a bayonet mount, but not like other lens types that I have. Their offices in California won't open for awhile if they're even open this weekend at all.

I'm really frustrated that right now have an expensive fisheye camera good for nothing else until the lens is removed.

Any suggestions would be greatly appreciated. Thank you!

Phil