No cut-a-way but they are as Kutter stated, part of the ejector mechanism. It been a long time since I have had one apart but as I recall, the buttons(rivets) intersect the rods that can be seen at the knuckle. It is part of the design that indicated which barrel has been fired. I only have one Flues ejector left in my collection, a grade 6, and it is too special to disassemble to refresh my memory.

Walter c. Snyder