At 10/23/2007 11:54 AM -0700, Rich Pinder wrote:
>The Durax crank on my Bertin is missing the nut on one of the cotter pins.
>So I went to my local hardware store, and had no luck finding a
>mate. I then saw a pin-set for sale on Ebay - but when it came, the
>pin was not correct diameter, and the nut wouldnt fit the original.
Rich, You may have trouble matching the threads unless you replace the cotters. I sell cotters and cotter presses and haven't noticed a lot of consistency in threads.
What diameter pin do you need? I stock 9mm (French) and 9.5mm
(English) and I can get 8mm and 8.5mm from a local supplier.
>Does anyone know what threads (size or type?) we're talking about
>for this nut ?? Would early french items be what we call 'metric'
>today, or are other types involved ??
France officially adopted the Metric System in 1795, but until fairly
recently there were no agreed upon "standard" thread pitches. In the
US you will not find fine pitch metric nuts in a hardware store.
>The pin is 40mm long, and the thread diameter seems about 7mm
>diameter at the threads.
7mm is also pretty rare and you wont find any 7mm fasteners in a hardware store. Sort of like trying to find 13/32" nuts to fit your Sturmey axle.
Mark Stonich;
BikeSmith Design & Fabrication
5349 Elliot Ave S. - Minneapolis. MN 55417
Ph. (612) 824-2372 http://bikesmithdesign.com
http://mnhpva.org