Luck

[colin addison]

Doesn't happen often but I broke the threaded section of the cotter pin that holds the clutch pedal to its horizontal shaft. After much swearing and then calming down I visited a local cycle shop.
The owner proudly announced he has a 1966 4-door and recognised the cotter pin immediately, it's a 9.5mm cycle part and in stock, of course.
I had visions of the design office in the Morris Works dreaming this one up!!
Colin

[mike.perry]

The other cotter pin which can break is the distributor clamp bolt on the later heads. The solution is to make them with a larger thread.
Do you have a photo of your cotter?