Very stiff focus ring in Ai-s Nikkor 105mm 1:1.8

Ai-s Nikkor 105mm 1:1.8 with a very stiff focus ring, is not
that hard to repair.
One of the most important thing when working with old lenses
is to remember to set small marks BEFORE take the helicoids apart,
and also remember to, AT INFINITY!, measure the distance from the
front of the inner helicoid to the very back of the lens body, without
the mount.
Also remember to measure from the front of the focusing ring
to the back of the outer focus helicoid, it's where the index ring sits.

Then remember to set a small mark on the inside of inner helicoid barrel
and the inside of the back helicoid, BEFORE unscrew, it's the same with the middle helicoid.
and count how many turn (s) it will take before the helicoids gets off the thread.

I use #10 helicoid grease from Japan Hobby Tools in this lens ( links down in the list ).
Here are some link's to different repair tool's and lubricating stuff:
"ORBIT" HEPA Blower:

https://photosol.com/products/orbit-hepa-blower/

You can buy it here:
https://www.adorama.com/cpkhjdb.html
"Liqui-Moly" LM 50 Litho HT:

https://www.amazon.co.uk/Liqui-Moly-Lm-Litho-400g/dp/B004FPSTAE
"Liqui-Moly" LM47 MoS2 grease with Molybdenum disulfide:

https://products.liqui-moly.com/lm-47-long-life-grease-mos2-1.html
or on Amazon:

https://www.amazon.co.uk/Liqui-Moly-3510-Langzeitfett-MoS2/dp/B00295CR0U?th=1
Contact glue:

https://www.loctiteproducts.com/en/products/fix/contact-adhesives.html
SpyderLENSCAL:

https://www.datacolor.com/photography-design/product-overview/spyderlenscal/
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 Herical Grease (Helicoid grease #10) 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
And you will also need some Isopropylalcohol 99%

And sometimes Lighter Fluid that is very good to clean lens element's.

NOTE: Do NOT! use Acetone on platic part's, it will damage / melting the plastic!!!

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