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Originally Posted by porterkids
Carlo,
Nice pictures. Phrobis originally used two different length screws to fasten the cutter plate to the scabbard. One screw is longer and projects slightly past the face of the cutter plate and is used to adjust the wire cutter. The screw pushes against the blade on the side of the pivot away from the wire cutter slot which forces the false edge of the blade tight against the cutter plate. The shorter scews were a special length and cost a premium. Using two different length screws also made it possible to assemble the cutter plate incorrectly which would have a negative impact on its function. Phrobis modified the scabbard mold to include an elevated boss for the hole that took the shorter screw. They were then able to use the longer, standard length screws in both holes.
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Thanks for the explanation Bill!
I did notice, indeed, that in the standard Phrobis/Buck scabbard one of the screw is longer, but had not understood (untill now) how it was supposed to work.
This makes very sense with what is written in one of the papers usually found in a mint M9 Buck commercial box, where there are instructions to adjust the wire cutter only by one of the screws.
I also found that the screw "higher" (or lengther) is sometimes responsible of some wear on the blade, expecially the black ones.
I little bit off topic, but I remember that, looking closely at some pictures of the XM9 bayonet, as submitted for the trials, it was possible to notice two screws (on the scabbard wire cutter plate, looking from the front)
of the very same lenght. There is a clear drawing showing this in one of the Cole books (don't remember now if it was book three or four).
So would be correct to say that the screws different lenght was introduced later, when the production started
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EDIT: Found, from my gallery, a picture of the box papers I was referring to!!!!!!!!!!!
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