at the bottom of this post is the Item Conversion when using Jasper, so if Flintlocks don’t have +200% WD, then look in the Codex and see if any Wizard Wands or Warrior Lances have it, and if they do, and it fits your Build, Jasper it to Rogue.
this is how Items of one Class can have something on it that can’t be rolled with Crystals and isn’t found in the LegendEx, it was Jaspered from another Class.