[Harp-L] Screws for coverplates

[Matthew Bullis]

Hello, due to I don't know what, the screws on the end of one of my harmonicas have disappeared. I picked this up and it was gone. I checked the other side and on the bottom is a standard screw, but the thing on the top is a female connection for the bottom screw to thread into. How do I get a set to replace the left side? Standard thickness on the harmonica.
Thanks,
Matthew