[TR] Rocker feed screw.

[Don Hiscock]

Thanks, Jonmac.  Most likely Sweden mandated a move to zinc and away from
cadmium.  Cadmium plating has some health and environmental risks that are
lessened with zinc plating.

On Wed, Apr 30, 2025 at 5:20 PM John Macartney <johnbmacartney at gmx.com>
wrote:

> Don,
>
> It came about as I recall sometime in the late 60s when I was working for
> the company in London. What started it (IIRC) was when there was an
> engineering change bulletin brought about by Sweden requiring cadmium
> plated fasteners instead of zinc, or t’other way about on all cars for
> Sweden. That allegedly precipitated the Belgian assembly plant seeking to
> use metric fasteners in certain areas, though not all, in their build
> sequencing. Coventry still built quite a lot of components that went into
> the kits for Belgium and for a while, most if not all cars going to Sweden
> were built in Belgium. Later on, Sweden destined cars reverted to UK build
> and I think it all died a very quick death and we reverted to imperial
> standard, apart from the cadmium and zinc issue which remained in place.
> However, it wasn’t plain sailing all the way in the Coventry and London
> service departments because the fitters started moaning about not having
> appropriate sized sockets and spanner’s for oddball UK home market cars
> that found their way in with strange metric hardware. All in all, one
> humongous cock-up all round and I don’t think anyone was sure who had
> suggested it all in the first place. Probably some acne ridden long-haired
> lout just out of university with a Divinity degree and who wanted to make
> his mark and change the world. Quite likely the same person was later moved
> into Purchasing and decided to change the metallurgical spec for Stag
> cylinder heads - and that’s somewhere no-one needs to go, EVER!
>
> Jonmac
>
> On 30 Apr 2025, at 23:34, Don Hiscock <don.hiscock at gmail.com> wrote:
>
> I'm not aware of any Whitworth threads installed by S-T (at least on a
> sidescreen car).  There may be some Whitworth and BA threads on bought-in
> components, like SU carbs, Smiths, and possibly some Lucas.  But I'll be
> shocked sh*tless to learn legit Withworth threads were used in a S-T engine.
>
> Jonmac, I'd never heard that metric and inch fasteners were used on the
> line at the same time depending on the end market for the vehicle.  That's
> a fascinating bit of trivia, and one of the reasons we love having you
> here!  What time period are you talking about for that?  Maybe 1970s?
>
> On Wed, Apr 30, 2025 at 4:27 PM John Macartney <johnbmacartney at gmx.com>
> wrote:
>
>> I have my doubts about the offending item having Whitworth ancestry.
>> While I’ve long been a Whitworth advocate and enthusiast (for purely
>> patriotic reasons) I think it might be worth going down a metric route.
>> There was a time when the factory briefly reverted to metric hardware that
>> was market specific for European build. Needless to say, certain bits of
>> hardware went where they shouldn’t (or inadvertently wound up there). Might
>> this be a possible avenue to explore? Evaluate metric fine and coarse pitch
>> threads.
>>
>> Jonmac
>> ** triumphs at autox.team.net **
>>
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>
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