Mine is just a wooden block ontop of the metal support bracket. From what I have seen, all of the rubber firing rests use that little metal tray. On the metal braket itself there should be two smaller holes that are threaded and close together. They are for the screws to hold the retaining strap in place.
And Nigel. Stop teasing with those last 3 pictures you posted. I need one of them also plus the actual shepards crook.
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Jordan Baker
RHLI Museum,
Otter LRC
C15A-Wire3, 1944
Willys MB, 1942
10cwt Canadian trailer
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