Removing Front Element of 90 C-Elmar

[trittium]

I purchased on the ebay, but it has a lot of crud behind the front element. Usually there are notches to loosen the retaining ring, but this lens does not have the notches. How to I get in there?

 

[trittium]

Can someone please point me in the correct direction with this. I am leaving tomorrow to go away for a week and would like to take this lens with me if I can clean it in time.

 

[trittium]

OK I figured it out.
1. Unscrew Element housing from focusing barrel
2. Remove the three screws on the aperature ring
3. Unscrew the aperature ring
4. The Ring Saying Leitz Wetzler Elmar-C yadadada comes off
5. Unscrew the next ring (uses something rubber to grip onto the ring)
6. Tap the lens on your hand, and the front element should come right out