Sticky focus ring in Non-Ai Nikkor-N·C Auto 1:2.8 f=24mm

The focus ring was very stiff in my old Non-Ai Nikkor-N·C Auto 1:2.8 f=24mm.
But it's "easy" in a way to fix. But when working with a lens like this, you have to take good care when disassemble it, and it's because of the Close-Range Correction System (CRC).

There is a front focus helicoid's that moves the whole lens assembly, and at the same time moves the back focus helicoid's that moves the back lens group, and in between there is also a lens group.

So, when moving the focus ring, all the lens groups shift position in relation to each other

REMEMBER to set a small mark when the helicoid's get off the thread, so it will be possible to assemble it again, And also measure how long is the focus assembly and also is the back lens assembly at infinity.
Here are some link's to different repair tool's:
Japan Hobby Tool rubber cone:

https://www.amazon.com/Japan-Vacuum-Camera-Opener-Repair/dp/B0013HFYKK/ref=pd_sbs_469_1?_encoding=UTF8&pd_rd_i=B0013HFYKK&pd_rd_r=RKSF5A4YKT9GV3E1382C&pd_rd_w=5H58m&pd_rd_wg=DBny2&psc=1&refRID=RKSF5A4YKT9GV3E1382C



18 different size rubber repair tool's:

https://www.amazon.com/Sizes-Lens-Filter-Wrench-Rubber/dp/B00988D1BK/ref=pd_sbs_469_2?_encoding=UTF8&pd_rd_i=B00988D1BK&pd_rd_r=RKSF5A4YKT9GV3E1382C&pd_rd_w=5H58m&pd_rd_wg=DBny2&psc=1&refRID=RKSF5A4YKT9GV3E1382C

Divider Caliper Wing Compass:
https://www.amazon.co.uk/Divider-Caliper-Compass-Marking-Machinist/dp/B015CN9A8M


You can also buy this set.

Lens Repair Set with pointed, flat, half flat tips:
https://www.amazon.com/dp/B00QRPWCN0/ref=psdc_3347581_t1_B00J5F6O92
JIS cross head screw driver's:
https://www.amazon.com/Moody-Tools-58-0219-Chromium-Screwdriver/dp/B004PGO1T6/ref=pd_sim_421_6?_encoding=UTF8&pd_rd_i=B004PGO1T6&pd_rd_r=775KBDR03D8PMMEZWKFJ&pd_rd_w=ti7yC&pd_rd_wg=s2a40&psc=1&refRID=775KBDR03D8PMMEZWKFJ
Or this set, that is the set I use:
https://eustore.ifixit.com/en/Tools/Drivers-Wrenches/JIS-Driver-Set.html?utm_source=iFixit&utm_campaign=Referral&utm_medium=modal&utm_content=145115
Lens cleaning wipes (PEC-PAD):
https://www.amazon.com/dp/B0161VIZZ8/ref=sspa_dk_detail_3?psc=1&pd_rd_i=B0161VIZZ8&pd_rd_wg=ZTxxY&pd_rd_r=RNY8S6Q1V5K18K3F61VZ&pd_rd_w=2c1Oy
Thin Cotton Buds x 200 you can buy them here:

https://www.muji.eu/pages/online.asp?lan=uk&ShopSel=y&scrn=1920&wndw=1920&sec=17&sub=70&pid=2469
DSLRKIT Pro Lens Vise Tool Repair Filter Ring Ajustment Steel 27mm to 130mm:
https://www.amazon.com/DSLRKIT-Repair-Filter-Ajustment-Steel/dp/B00SYBYTZO
Japan Hobby Tool Helicoid Grease Made in Japan:

https://www.amazon.com/Japan-Hobby-Herical-grease-JHT9110/dp/B0014ZU03M
Loctite 222 50ml Threadlocker

https://www.amazon.com/Henkel-Loctite-Threadlocker-Super-Screw/dp/B013SDAWQC

Видео Sticky focus ring in Non-Ai Nikkor-N·C Auto 1:2.8 f=24mm канала mikeno62