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I've done a lot of searching but haven't found much regarding film Advance lever/trigger errors. Symptoms: lever will advance once or twice, with the firing sound being a dull "krk", not the bright "K-chung!". After one or two advances, the mechanism becomes jammed, and one cannot fire or Advance. Removal of lense showed that mirror was not flipping up during misfire. Removal of bottom plate showed that internal mechanisms were not pulling spring fully, which was not cocking the firing gear hammer arm(I wish I knew the nomenclature! See pic.)

Any clues? I read somewhere that the white firing gear may just need lubrication.

Would wd-40 be appropriate for internal SLR mechanisms?

Thanks in advance mechanism in question. Spring at top, driver touching hammer arm, white gear  in middle

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    I'd avoid the WD-40 as it is more of a solvent than lubricant. Sorry I don't know exactly what to recommend. I got a lot of mileage out of my SRT101, it was a good camera for me. May 20, 2017 at 2:14
  • If you move the gear you are talking about, does the mirror move? The internals of my working SRT 101 look just like yours, except that some of the metal parts appear yellow on mine.
    – ToastHouse
    May 20, 2017 at 4:57
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    WD-40 is a moisture dispersant and cleaner, not a lubricant. The "WD" literally stands for "Water Dispersant." When it is wet it will make things slide a bit easier, but when it dries out they will be less lubricated than before because it will have washed away most of what lubrication may have been present before spraying it with WD-40. For most internal camera applications that require lubricants use either a thick lithium based grease (gears, levers, etc.) or very small amounts of mineral/machine oil (pivot points, etc.).
    – Michael C
    May 21, 2017 at 2:50
  • I found this years late whilst reviewing one of the answers - the popular, yet incorrect 'factoid' that WD40 is not a lubricant - wd40.com/myths-legends-fun-facts - though I still wouldn't use it on something like this.
    – Tetsujin
    Jul 21, 2020 at 8:54

2 Answers 2

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Will this camera repair site site help ?

https://learncamerarepair.com/product.php?product=42&category=0&secondary=0

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    If you download and use the manuals on that site, please remember to donate a few dollars to help the operator keep things going and keep adding manuals for other cameras.
    – Zeiss Ikon
    Apr 14, 2021 at 18:13
  • Welcome to Photography! Whilst this may theoretically answer the question, without following the link and evaluating its contents, there's no way to determine if this answers the question. Please edit your answer to include the essential parts that address the question, and provide the link for reference. Thanks.
    – scottbb
    Apr 14, 2021 at 18:22
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Use electronics cleaner on the mecahnism shown in your pic. You need to free up the gunk that is making it stick. The cleaner removes the gunk and it evaporates quickly. Only lubricate if you absolutely need to. WD-40 is an option, but be careful not to overspray.

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    Solvents of any kind, applied without disassembly, simply move the crud to other places. WD-40 is never the right product for a camera. Better to look on eBay for another one than take this advice.
    – Zeiss Ikon
    Apr 14, 2021 at 18:12
  • That is why electronics cleaners often come as a two part kit, one spray is a strong cleaner, the other is a wash to drive all the cleaner residue and dissolved gunk out.... Apr 17, 2021 at 10:14

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