Jerry, you have the eyes of a hawk
When I checked and cleaned the cabinet, I could hear something tumbling around inside the machine, and it was the metal plate, holding these screws. In the past the original screws had loosened, something that I have also seen on other HMV floor models, and as a result this plate falls inside the cabinet and the original screws has been replaced. I was able to get the plate out, and of course, these screws don't fit. I will take the original screws on one of my 157 models for now, and also install the plate. I have just been lazy some days (with other gramophone projects) postponing this small task.
It should not be postponed, since these screws are the only unoriginal parts on this gramophone jewel.