Threadworx has replaced Needle Necessities; in all files the conversion number is in parentheses.
Checklists for these lines of floss are at:
Alphabetical Needle Necessities at
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Needle Necessities at
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Threadworx at
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Threadworx at
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I've culled internet and old hardcopies for information (nothing official) so please let me know if there are omissions or corrections.