Completed with using only parts from the both lenses except 'a black clip pin' for the new aperture linkage,
and of course CMHT (M42->E adapter) is necessary. The optical block, Rokkor's LBH, and the filter frame
are not glued, you can unscrew them for infinity focus adjustment when you need to. Length=42mm(1-5/8")

The aperture 1.7 in the above is the lens' F2 position, the other
F-stops are exactly match with the lens', maybe very "luckily".
There are also click stops between F-stops except bellow F2.8.

The tools I used are: two different size plus drivers, a surgical tweezer, a hammer,
two large and small minus drivers, a small vise grip, many tooth picks, some papers,
an epoxy glue, a black manicure set, an electric drill and chips, non slippery cloth,
a black sign pen, a piece of cloth, a vernier, a piece of wood, and many kinds of files.