casting a brass nut

[MWF FEED]

Hi all .. Had this in the general section.. some may already have seen it..I need to reproduce this nut for a vintage vice I am working on.. thread diameter is 7/8" or 22.2 mm.. pitch is just over 4 turns to the inch..
because of the mystery number of turns, and as it is brass, would it be possible to cast a new nut around the screw ???
Ken100_3138.jpg (http://metalworkforums.com/attachment.php?attachmentid=379575&d=1558739276)100_3140.jpg (http://metalworkforums.com/attachment.php?attachmentid=379576&d=1558739276)100_3137.jpg (http://metalworkforums.com/attachment.php?attachmentid=379577&d=1558739276)
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