How to get to the aperture blades of a Jupiter 9?

I have a Jupiter 9 for Kiev mount that has very oiled aperture blades. 2 of them are already out of place. I have found 2 documents on the web that describe how to relube a Jupiter 9 but they don't explain how I can get into the housing where the blades are.

Does anybody has any hints for me? The glass block is screwed out, the rear lens removed, I can see and reach them, but I have to remove and clean them, they are very sticky.

Ulrich

http://fotos.cconin.de

Old Jupiter9 has the tendency of separate blades from its pins, <u>by this same reason they are factory oiled and must be kept so</u>.This is done in order to keep the blades tight, and reduce the external diaphram ring out to be loose.
To do a good job you need not to dismantle the unit. With a needle or a fine jeweler screw drive you try to replace blades in the right position. Now clean everything with carbon tetrachloride, removing the old oil- Then place a drop no more than a drop of a new thin machine oil. Everyting is done. Reassemble the unit.
LP

Luiz,

thanks for the help. With a fine needle I was able to put the loose blades back into place.

Ulrich

http://fotos.cconin.de

Good luck and good photos with your J/9 Ulrich!
Regards
LP