mortifactor
Well-Known Member
It doesn't look like his finger and it is consistent with the other images showing something covering the round metal disc on the scope mount. I reckon the rough outline of a circle within the screws of the disc is from where this part fell off. From this pic it looks to be nearly the same diameter as the spacer beneath the mount (which was about 1 - 2mm wider in diameter than the disc greeble), which would mean it could likely cover the 3 screws on the disc. Hard to be certain though.