Yes mine had that, too. The damned thing was also restricting the maximum aperture. Yes I head to disassemble such shutters and make the opening larger (that thing was part of the aperture assembly and could not be thrown away completely). The shorter the Polaroid lens was in focal length, the narrower the opening was and the more often disassembling was mandatory but some Copal Press shutters of the type had that ring thin so it did not get in the way of the glass elements, and in this case it was possible to leave it in its place - unless a really large lens like a 210 Symmar that needed a larger aperture opening was to be fitted into the shutter.