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Base plate screw

 
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AJP



Joined: 14 Apr 2010
Posts: 10
Location: Newcastle upon Tyne, England

PostPosted: Fri May 05, 2023 9:30 pm    Post subject: Base plate screw Reply with quote

Whilst 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?
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Henk



Joined: 28 Jul 2022
Posts: 1
Location: The Netherlands

PostPosted: Sat May 06, 2023 5:50 am    Post subject: Reply with quote

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
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murff



Joined: 27 Oct 2009
Posts: 592
Location: Switzerland

PostPosted: Sat May 06, 2023 8:30 am    Post subject: Reply with quote

I will send you a screw for free - please PM your address....


Happy Coronation Day
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Kmcqueen



Joined: 14 Apr 2023
Posts: 26
Location: Portland OR, USA

PostPosted: Thu May 11, 2023 4:52 am    Post subject: Reply with quote

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
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murff



Joined: 27 Oct 2009
Posts: 592
Location: Switzerland

PostPosted: Thu May 11, 2023 7:25 am    Post subject: Reply with quote

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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