[TR] How do they manufacture gears?

[Randall]

> Then they 
> are case hardened to resist wear withoug becoming too 
> brittle. 

I've been wondering about that.  Some simple experiments with original
Triumph gears seem to indicate that they are not case hardened.  In fact,
they aren't very hard at all.  Compared to say, a cheap socket, they cut
quite easily.  So I would guess that they are only heat treated and left at
a moderate temper.

Randall