For Jupiter-3: ever notice a slight play in the focus, where it moves some small fraction of a millimeter before the dampening kicks in? OR -worse- it jams up after a CLA?
I learned to keep the guide screws in order, put them back in the same slot that they came out of. 90% of the time, will not make a difference. 10% of the time is where I spent 90% of the time figuring this out. These are the screws that hold the two main helicals together. When a lens has a lot of play, I will use a larger guide screw when re-assembling. The guide screw is "about the same" as that used for the aperture linkage. I built up spare parts by doing Sonnar conversions for people, keeping the old J-3 modules as part of the deal. Got a couple of good J-3's, and a lot of spare parts that way.
I use 1 scribe for the first rail and 2 scribes for the second. For the screws for the focus ring: I also keep in order, start with the hole counterclockwise from infinity mark. I've seen different sized screws used in the focus ring before. Will drive you nuts when re-assembling.
Make Scribe Marks to re-assemble. by fiftyonepointsix, on Flickr
Keep screws in order, put back where they came from by fiftyonepointsix, on Flickr
Focus Stop Screw: Always set to Infinity to re-assemble. by fiftyonepointsix, on Flickr
I learned to keep the guide screws in order, put them back in the same slot that they came out of. 90% of the time, will not make a difference. 10% of the time is where I spent 90% of the time figuring this out. These are the screws that hold the two main helicals together. When a lens has a lot of play, I will use a larger guide screw when re-assembling. The guide screw is "about the same" as that used for the aperture linkage. I built up spare parts by doing Sonnar conversions for people, keeping the old J-3 modules as part of the deal. Got a couple of good J-3's, and a lot of spare parts that way.
I use 1 scribe for the first rail and 2 scribes for the second. For the screws for the focus ring: I also keep in order, start with the hole counterclockwise from infinity mark. I've seen different sized screws used in the focus ring before. Will drive you nuts when re-assembling.
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