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I think this is the ideal lens to learn lens construction on, it's cheap & it's simple.
This is a quick bunch of shots, so pardon the bad photography. 
The first shot is not the same lens as those that follow, but is built the same.
***Mark orientation before taking anything apart***
The screws can become rusted, and weak, the screw head could break, turning a slot into a D, so be aware of that issue.
http://farm7.static.flickr.com/6156/6187252885_6df1dc1dd7_z.jpg
3 screws hold the focus ring, loosen those and it slides off.
http://farm7.static.flickr.com/6173/6187253303_84341d33dc_z.jpg
Turn the front end counter clockwise and the optical block and spacer are separated from the helicoid.
http://farm7.static.flickr.com/6155/6187775502_bb8903e263_z.jpg
3 screws hold the scale ring in place, but it does not need to be removed (I do in later shots).
3 screws hold the helicoid to the mount.
http://farm7.static.flickr.com/6151/6187775972_86f30a5ccc_z.jpg
1 guide screw removed allows the helicoid to be disassembled.
http://farm7.static.flickr.com/6172/6187776462_74cbcc5477_z.jpg
now clean with a solvent and brush, wash with soap and brush to remove any solvent that could break down the new lube.
http://farm7.static.flickr.com/6178/6187777918_660815ff6b_z.jpg
Time to re-lube and assemble, I use lithium grease and a small art paint brush, just enough to coat the threads.
Edit: I stopped using Lithium grease, I then started to use "Orange Solid Oil" search for "TLNC 4" which works great, it's like a gel, the only issue with it is it causes more complicated helicoid designs(eg. FD, Minolta MC, Takumar...) to require more effort then I'd like, I then ordered some grease(#10) from micro-tools.com(can also get it at japan-hobby-tool.com) which works a whole lot better, effort is much reduced.
http://www.micro-tools.com/store/P-HG-10/Grease-Helical-10-Light-8ml.aspx
http://www.japan-hobby-tool.com/cart/syouhin.php?cat=00000010&no=00000048
http://farm7.static.flickr.com/6167/6187257111_c2cdaedf5e_z.jpg
Now you put Humpty together again.
You know you got it right if the stop screw hits it's stop just before it bottoms out.
http://farm7.static.flickr.com/6180/6187257435_6c563ff047_z.jpg
Ok, now re-lube the mount/helicoid assembly, the recess in the helicoid that the mount fits into, the mount, the part that fits in to the helicoid, and the inside groove that is where the guide screw slides, line up the guide screw and the grove and mate them, then lube the inside of the retaining ring, screw it down on the helicoid assembly, you want ittight enough that there is no play, but not too tight that it's too hard to turn the helicoid, you may feel tight spots where the set screws were before,you will need to go past 3-6 of those to get where you need to be, tighten the 3 screws to lock it together. you can check how smooth the helicoid is now, and wipe any excess lube off, leaving the helicoid thread as is.
http://farm7.static.flickr.com/6172/6187258469_b85acf8165_z.jpg
reverse the previous instructions to put it all together again.
http://farm7.static.flickr.com/6175/6187259503_779c1fdd30_z.jpg
Now about the optical block, I haven't attempted to clean the aperture assembly yet, as I haven't needed to as mine are clean and dry, but all you need to do is
set the aperture to it's smallest opening, remove the small screw that sits in the slot, don't forget to mark first, then there is a large head screw that needs to be backed out some, then you can unscrew the back end cover.
http://farm7.static.flickr.com/6151/6187493015_37030b197e_z.jpg
that will expose a small set screw that holds the aperture assembly to the front 1/3of the optical block assembly, the rear optics can also be removed.
http://farm7.static.flickr.com/6165/6188014086_877d7720d5_z.jpg
leaving the aperture by it's self, you should be able to rinse the whole thing in solvent if needed, you may want to add lube at this time to the aperture stops.
http://farm7.static.flickr.com/6165/6188013756_71b06ca00d_z.jpg
The rear element retainer didn't want to unscrew by hand so I didn't bother for these shots, but is easy to do.
I can probably tear apart, clean, lube and re-assemble a Helios in an hour now that I've done 3 of these.
Edited on Sep 16, 2012 at 02:49 AM · View previous versions
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