Cal Hawkes Posted August 14, 2019 Share Posted August 14, 2019 Greetings So the issue is removing the reverse-thread two-hole screw in the middle of the Krasnogorsk-3 winder. I am reasonably skilled in the camera dissembling department, but cannot fathom how to unscrew this piece without ruining the entire component. There have been words on these forums about a "special tool" that can slot into these two holes and work off the screw, but I have been unable to source a specific product or method to remove said screw. The screw is on there very tight, and I have tried the "two small screwdrivers" in each hole to no joy. And it seems a crying shame to ruin an otherwise decent piece of chrome. I can't imagine changing the spring of a broken K-3 to be too rare an occurrence, so if anyone could tell me how to unscrew this little bastard, I would be very grateful. Many thanks ? Link to comment Share on other sites More sharing options...
Premium Member Simon Wyss Posted August 14, 2019 Premium Member Share Posted August 14, 2019 The correct tool is a pins wrench. There are different forms of it for the various face bores screws, sometimes called snake eyes head screws. They aren’t expensive. Measure the holes’ diameter before you buy. Link to comment Share on other sites More sharing options...
Cal Hawkes Posted August 14, 2019 Author Share Posted August 14, 2019 Hello Simon Thank you for your reply. I have looked into these online, and will give them a try. Hopefully this will solve the issue. Kind regards Calum Link to comment Share on other sites More sharing options...
Premium Member Dom Jaeger Posted August 15, 2019 Premium Member Share Posted August 15, 2019 Pin wrenches tend to be larger than what you need, but are often adjustable. A 2 prong driver, or slotted spanner driver, is usually smaller and more useful for this sort of application, but needs to be the correct spacing and prong size. Eg: https://www.amazon.com/uxcell-Magnetic-2-6mm-Spanner-Screwdriver/dp/B07B7L8NHF https://www.wihatools.com/slotted-spanner-nut-driver-m2-6 You may need to round off the prongs with a file to fit in small holes. I often make my own by either filing down the centre of an appropriately sized slotted screwdriver (you need a good small file) or turning a tool on the lathe and fitting 2 steel pins in the end. 15 hours ago, Cal Hawkes said: I can't imagine changing the spring of a broken K-3 to be too rare an occurrence.. I would think it's actually quite a rare occurrence.. why go to all that trouble when you can buy another K3 for a hundred bucks? What are you replacing the spring with anyway? Link to comment Share on other sites More sharing options...
Premium Member Simon Wyss Posted August 15, 2019 Premium Member Share Posted August 15, 2019 In many cases the spring is not broken but hopped loose off the core. Link to comment Share on other sites More sharing options...
Cal Hawkes Posted August 15, 2019 Author Share Posted August 15, 2019 14 hours ago, Dom Jaeger said: I would think it's actually quite a rare occurrence.. why go to all that trouble when you can buy another K3 for a hundred bucks? What are you replacing the spring with anyway? Hi Dom Thanks for your response and the attached links. I really appreciate it, and you make a valid point. I would be replacing the "broken" spring with a replacement I bought a while back. However, I am intrigued to hear that maybe there is nothing wrong with the spring at all. Thanks for this info @Simon Wyss . The issue with the current spring is extreme overwinding, to the extent the film slows down after only a couple of seconds. The camera is quite a nice incarnation of the K-3 compared to the later 80s models, hence my interest in getting the thing running properly. Many thanks Link to comment Share on other sites More sharing options...
Cal Hawkes Posted August 15, 2019 Author Share Posted August 15, 2019 10 hours ago, Simon Wyss said: In many cases the spring is not broken but hopped loose off the core. Hi Simon I mean, I have a tested spring ready to replace the old overwound "broken" one. But this is definitely an interesting point. Maybe the issue lies with me meddling with perfectly good Soviet tech ? Many thanks Link to comment Share on other sites More sharing options...
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