I had bought a set of three from Trade-Ex - no longer sure what size they were - M5-0.8 or similar? Is always the game - to ID what size is needed - unless you have "bushels" on hand, to try various, to see what fits and is correct thread. Chances are good they are a metric size if done in Sweden - about most anything possible for size and thread pattern if done else-where. Once finding correct size and thread pattern, should not be too difficult to make a "plug", to length, with a dremel slot?? I have filled a few holes with plug screws - I found it handy to use a drop or so of the blue thread locker to hold them from turning in or out, until you want to turn them.