Asvine tools are readily available on Amazon.
But do you really want to use an inexpensive Chinese tool to do a repair on a Montblanc Hemingway fountain pen?? Yikes!!
For not a lot of money (comparatively speaking when one considers the current price of a Hemingway) one can acquire a tool specifically manufactured for use on Montblanc pens.
Furthermore, if you are not an experienced repair person I would think real hard about setting yourself loose on a Hemingway!
Why not tell us more about what you are dealing with and perhaps post some photos. There are some real experts who visit here and one of them might be of great help to you.
Good luck!
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