I checked two of them from the parts bin, both seem to be 2BA threads.
.1850" by 31.75 tpi, with a 47.5 degree thread angle, and rounded crests
and roots ala Whitworth.
I wonder if the Moss unit is a metric approximation ? I understand
that's a common problem when having parts custom-made overseas ... the
samples are fine, but the production units come with threads "as close
as our lathes could cut".
Randall
"Woods, Ed" wrote:
>
> Listers,
>
> Here's a "thread" question for all of you and, perhaps, a stumper for
> Randall:
>
> What is the thread size on the TR3's vacuum advance unit? That's the long,
> threaded extension onto which the knurled nut attaches, not the one for the
> vacuum line.
>
> I just got a brand new one from Moss and the knurled nut doesn't fit.
> Otherwise, it's a beautiful Lucas unit, identical to the original. Even has
> the threaded vacuum extension for the original female fitting on the vacuum
> line.
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