[Bell Historians] Identification requested

[Bickerton, Roderic (SELEX GALILEO, UK)]

How interesting, would this have been a "by request" feature. 
Is it now a standard feature?
I wonder if the bull ring installation had twiddle pins as installed or
if they were were added at a later date.
Prior to this thread I had not been aware of twiddle pins earlier than
those on Bushey, (1973, I think.)
 
SELEX Sensors and Airborne Systems Limited
Registered Office: Sigma House, Christopher Martin Road, Basildon, Essex SS14 3EL
A company registered in England & Wales.  Company no. 02426132
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