Hi all, So I purchased a super cheap 1.1million serial numbered zuiko 50mm 1.4 off of eBay with a sticky aperture. I have disassembled the back half and fixed that as well as cleaned the dusty glass, and put it all back together fine. Whilst cleaning I found that the front element has some condensation behind it. I have managed to remove the front facia, bezel and aperture ring, remembering not to lose the ball bearing and spring, but for the life of me I can't work out how to remove the retaining ring that holds the front element(s). I have read online that some of the earlier models use 3 sometimes varnished screws which this one doesn't have. Any thoughts or experience would help me greatly, Cheers guys.