Swing arm bushing failure

[max]

See if you can see the same thing that i can, notice the bright ring on the start of the conical part of the shaft?

Looks as if the nut "bottomed out" on that part, continued to pull on the thread and stretched it for no good reason.

Threre is no rust on the broken surface, looks a recent event.

A simple washer could have prevented this, which begs the question;
Has a washer been used originally but since been omitted for some reason?

Cannot remember if my bolt was hollow but don't think so.

edit; yup,it's hollow and no washer installed here either;



This would be impossible to spot by the assembler at the time unless he had a lot of experience and the guts to tell his supervisor on the line, in the meantime.........

Great shots by the way