My period correct sling hooks will not fit my model 1900 front sling eye. When I first looked at it I thought that it had been changed to something else but, upon further disassembly I think what is there might be original. The eye in the photo has a hole that is way too small for my sling hooks. I thought that the eye part should be the same as the eye part in the butt sling eye as shown. Anyone have a model 1900 or that knows what's going on with it?