Just a WAG but the timed screws, which cut into and clearly post date the application of the view marks, seem to line up with the ejector kickers shown at the front of the knuckle.

Might they indicate a conversion to ejector, perhaps covering vertical springs?

Perhaps intercepting sears were added at the same time?

Though as Ted says it is more common to find that they have been removed as being more trouble than they were worth.

Last edited by Parabola; 11/10/24 04:33 PM.