Screws, Captive and Circlips
With regards to the captive screws used with the Plates, Mounting No.1, it is possible the retaining clips used on them are known as 'Circlips' and as Chris suggested, they are indeed used as part of the mounting hardware for the series of Wireless Set No. 19 Control Boxes. They are listed as: Circlips No. 2, ZA 14719 and are used in conjunction with Screws, Captive No.7. I have yet to find any specifications on these particular screws.
Screws, Captive No.5 are used to lock the PSU into it's case and Screws, Captive No.4 are used to mount the 19-Set Transceiver into it's case. In both of these items, the screws are held captive by first threading through their respective face plates. No retaining clip is fastened around the screw shaft.
David
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