Hello My lens that I got needed a really good cleaning, so I took it apart completely, lubing up the helical and cleaning everything. The blades also needed cleaning (and the aperture ring needed lubing), so I also took that apart. - I knew it was going to be a challenge getting it back together but.......what the ...?? How the heck to get it back together again? Is there some tool that the Leica-workers used to get the aperture blades aligned and in position? I just cannot seem to get the last 3 blades in, no matter what I do, something slips and it's back to start again. Anyone have any experience with this that can give some good pointers as to how assemble? Magnets?? Glue?? Some special tool?? I cannot imagine Leica-factory workers spending 1 week on the aperture back in the day, how the hell did they assemble this thing?