This lens is in very nice cosmetic condition, but had a lazy aperture and there was a gray things in the lens edge.
The lens itself was nicely built. Very high quality precision parts, and quite easy to service. Most of the Super / SMC / Super Multi Coated Takumar that I worked on have similar design. The steps outlined here could be used as a guide to other lenses in this family.
As for image quality, I can’t make any comment, since I never use these lenses ( I got 2 in minty conditions). The focal length is too close to 30mm, so I always use my K 30/2.8.
Remove the front name plate (A) with a friction tool. As usual I use the rear cap covered with heavy yellow rubber glove. In this copy the ring was stuck, so I dropped a few naphtha, put the front cap and let it sit for an hour.
There is another part under the front plate. It is attached by 3 screws. Remove these screws.
Underneath you will find 3 screws with brass washers. These screws connect the focusing ring with the outer helicoid. Remove these screws.
Remove the focusing ring. Also remove the DOF scale ring, it is hold together by 3 small headless screws. Now you could remove the aperture ring. Again, be careful of the ball bearing underneath.
With a spanner, remove the front lens group (A).
Now separate the aperture actuating assembly by removing the 3 screws on the barrel.
If you need to relube the helicoid or accessing the aperture blade, remove the 2 tabs (A) each held by 2 screws.
The lazy aperture was not caused by oil on the blade. It turned out that by loosening the 3 screws a little bit, the aperture was snappy again.
On reassembly, make sure the the position is right. The aperture actuating lever & hook (for I don’t know what to call the F shaped part) (B) and the notch and ball bearing spring (C) are in the same position.
If you need to access helicoids, just turn the brass ring until the the helicoids disengages. To access the aperture blade, you have to remove the O ring with a spanner.
After completely disassemble the lens, the gray thing turned out to be some flaking lens blackening paint.
Note on reassembly
Reassembly is quite straightforward, just reverse the process.
If you remove the helicoids, you need to adjust infinity focus :
A. Asemble the lens until you arrive at step 4. Mount the lens to a camera with known good focusing.
B. Focus the lens at a distant object. Now mount the focusing ring at infinity position. Attach only 1 screw, don’t tighten too much. Check the focus again, if it moved, loosen the screw and readjust.
C. Put the rest of the screws and tighten.