You can all postulate what the thread is "close to" but as mentioned above by the OP, The original German military blueprints CLEARLY state that the screw is Whitworth 3/16 English Nr. 30... The use of any CLOSE substitute is still going to bind when you tighten it, and will possibly mess up the frame threads if you force it...
I do not recommend subtituting this screw with something "close".
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regards, -John S
"...We hold these truths to be self-evident that ALL men are created EQUAL and are endowed by their Creator with certain UNALIENABLE rights, and among these are life, LIBERTY, and the pursuit of happiness..."
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