BP, you could try to "cheat" the last part of the flail into your inventory using Shadowkeeper. It's not really cheating as you had a chance to get the part but you just lost it somehow. It would be a shame if you were to be punished for that by not getting the flail.
If you just cheat the last part you'll still have to forge the flail.
If you want some instructions on Shadowkeeper, just post here again.
Good luck!
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Melusine, Archbabe of the OHF and the LH
Your voice is ambrosia