Hi everyone, I have this really big Derogy Aplanat (26" FL) that can be disassembled, except for the front element. I'm guessing that the whole ring (sometimes we see these painted black) behind the hood mount should come off? Does anyone have a similar model of which they can take a pic?

I got the hood of using this PB Blaster spray which worked really easily but I can't get this element or for the life of me! Click image for larger version. 

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