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Steps:
1. Create level 100 crafting/gathering gearset (e.g. Ra'Kaznar Needle with 5x materia meld)
2. Craft new Ra'Kaznar Needle and have it in the armory inventory
3. Change gearset, and change back to weaver (e.g. Ra'Kaznar), the new unequipped Ra'Kaznar Needle got equipped instead, and gets soulbound on your next craft.

OR

4) Repeat step 1 and 2,
5) Put new Ra'Kaznar Needle on marketboard
6) Return to Inventory (It goes back to armory inventory)
7) Change gearset, and change back to weaver (e.g. Ra'Kaznar), the new unequipped Ra'Kaznar Needle got equipped instead, and gets soulbound on your next craft.