Stiff focus ring and loose lens assembly and other details IN Summicron-C 1:2 / 40

In this video about the Summicron-C 1:2 / 40 for the Leica CL camera.
I will show how you can fix the stiff focus ring and the loose lens assembly, but also many other details related to the focus helicoid.
And I will also show how to fix the stiff aperture ring.

I also made a special tool to unscrew the back retaining ring.

REMEMBER to measure and setting small marks BEFORE disassemble the focus system, I made some notes about the measurement focus helicoids and how many turn before the inner and outer helicoids, before they separate.

All this notes, because there is NO (0) repair manual about this lens.



Here are some link's to different repair tool's and lubricating stuff:


Clamp tools:

https://www.ebay.co.uk/itm/3640379611...


Flex-I-File:

Ultra Fine Needle Piont Scriber #6114
www.flex-i-file.com
www.alphaabrasives.com




Dental instruments are:

Hollenback Carver


“plastic instrument” (a.k.a. stellite)



Wall’s carver.






"ORBIT" HEPA Blower:

https://photosol.com/products/orbit-h...

You can buy it here:
https://www.adorama.com/cpkhjdb.html




"Liqui-Moly" LM 50 Litho HT:

https://www.amazon.co.uk/Liqui-Moly-L...



"Liqui-Moly" LM47 MoS2 grease with Molybdenum disulfide:

https://products.liqui-moly.com/lm-47...



or on Amazon:

https://www.amazon.co.uk/Liqui-Moly-3...




Contact glue:

https://www.loctiteproducts.com/en/pr...




Japan Hobby Tool rubber cone:

https://www.amazon.com/Japan-Vacuum-C...



18 different size rubber repair tool's:

https://www.amazon.com/Sizes-Lens-Fil...



You can also buy this set.

Lens Repair Set with pointed, flat, half flat tips:


https://www.amazon.com/dp/B00QRPWCN0/...



JIS cross head screw driver's:


https://www.amazon.com/Moody-Tools-58...


Or this set, that is the set I use:


https://eustore.ifixit.com/en/Tools/D...



Lens cleaning wipes (PEC-PAD):


https://www.amazon.com/dp/B0161VIZZ8/...



Thin Cotton Buds x 200 you can buy them here:

https://www.muji.eu/pages/online.asp?...



DSLRKIT Pro Lens Vise Tool Repair Filter Ring Ajustment Steel 27mm to 130mm:


https://www.amazon.com/DSLRKIT-Repair...


Japan Hobby Tool Helical Grease Made in Japan:

https://www.amazon.com/Japan-Hobby-He...



Loctite 222 50ml Threadlocker

https://www.amazon.com/Henkel-Loctite...