Oscillating roller and crescent question for an odd press

I have an Italian FTC (Fonderia Tipografica Cooperativa) proof press with an oscillating roller that doesn’t move very smoothly. I removed the screw cover, set screw and what looks like a crescent holder screw without a crescent. The worm gear only has one simple groove in it. The roller has a notch it that seems like it should accommodate a crescent. If so, do I need a new crescent holder as well? The crescent holder screw measures 5/8in (about 16mm) in diameter. By any chance is that the same as a Vandercook? I’ll try to upload an image in the comments.

Thanks,
Jon

image: Screenshot 2024-09-29 at 6.26.03 PM.png

Screenshot 2024-09-29 at 6.26.03 PM.png

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