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The Curta.org Bulletin Board Welcome to the Curta.org Information Exchange Forum for the Curta Enthusiast Community |
| Base plate screw | |
| Author | Message |
|---|---|
| AJP Joined: 14 Apr 2010 Posts: 10 |  Posted: Fri May 05, 2023 9:30 pm Post subject: Base plate screwWhilst competing on a rally a few weeks ago with my wife navigating for me, we unfortunately lost one of the screws that hold the base plate in position on her Curta, does anyone have any spare ones they would sell? Alternatively do you know the size/thread profile so I could buy an alternative? |
| Henk Joined: 28 Jul 2022 Posts: 1 | Posted: Sat May 06, 2023 5:50 am Dear Ajp, I recently came across two of them on the german ebay. Mayby you could contact the seller. https://www.kleinanzeigen.de/s-anzeige/curta-bodenschrauben-2x/2402942975-234-2694 |
| murff Joined: 27 Oct 2009 Posts: 620 | Posted: Sat May 06, 2023 8:30 am I will send you a screw for free - please PM your address.... Happy Coronation Day |
| Kmcqueen Joined: 14 Apr 2023 Posts: 38 | Posted: Thu May 11, 2023 4:52 am Related to these base plate screws......Do we know why some of them seem to corrode while the rest of the Curta is fine?? Does it have something to do with the cushion in the bottom of the can ?? (for example - like these) https://ibb.co/DDNj90d |
| murff Joined: 27 Oct 2009 Posts: 620 | Posted: Thu May 11, 2023 7:25 am The screws are made of a brass alloy (Ms58Pb) and nickel-plated. Under "normal" conditions, these screws are corrosion resistant - but there are definitely substances that can attack this corrosion protection (e.g. decomposed rubber...?).  In the first Curtas, these screws of the base plate were made of steel and mostly black discolored...  Therefore, I have replaced the rubber padding on all Curta containers with a wool felt, which has about the same elasticity and is chemically neutral. |
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