Neil,
The screws are indeed British cheese head screws and they are Whitworth
specifically BSF (British Standard Fine) 1/4" X 26 TPI and 7/16" long.
Here's a link to the specific page at British tools and Fasteners for the
screws you need in 1/2 " length (close enough)...
http://www.britishfasteners.com/index.php?crn=43&rn=11050&action=show_detail
British Tools & Fasteners, LLC
7696 Route 31
Lyons, NY 14489
USA
Almost all Lucas Electrical parts were dated with the month, a space, and
the last two digits of the year, so yes, 3 58 is March of 1958.
Cheers,
Curt
On Wed, Apr 6, 2011 at 12:58 PM, Neil Anderson <neilandcustom@gmail.com>wrote:
> List,
>
> I have another question. Does anyone know of a source for the round flat
> top screws that hold the Lucas Altette HF 1748 horns together? I think
> they
> might be referred to "cheesehead" screws or something similar. Screws like
> this of a different size hold the dash pots to the carb body.
>
>
>
> The size of the screws are about 7/32 x 7/16 and are probably Whitworth.
> Two longer ones are used at the bottom of the horn to attach the mounting
> bracket.
>
>
>
> The brass tag on the back has a 3/58 at the end of the number sequence. Is
> this the date of manufacture of the horns?
>
>
>
> Any sources for British fasteners would be appreciated. Thanks.
>
>
>
> Neil Anderson
>
> Malta, IL
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