help - canon QL17 - round 2

Ok, it looks like oil has gummed up the shutter on my canon QL-17 Giii.
I have been able to remove the front element, but the 2nd element wont budge. I tried going around the back as well but it is locked tight and I am going to ruin it if i force it.

Can anyone lend some advice to getting to the shutter?
THX

Haven't worked on a Canonet myself, but you probably want to look through the repair forum at http://www.kyphoto.com/classics/. I am sure this sort of thing comes up quite regularly.