Add the Dual Weapons.

///Introduction
This weapon are 1hm base, when equip this, equipped automatically left arm that are slot 61 armor.
so I recommend blank this slot before run this but if using this slot unequip automatically like vanilla.
if drew this or unequipped, removed this from Actors(Player or NPC) inventory.
the weapon will be able to see like Dual by custom motions.
if left arm are showing even if change other, equip the dual weapon again.
the left arm graphic are pipboy on ground, so we can pick up if drop to floor from inventory menu by mistake.

///Install
install this by any Mod manager or put directly as loose file.

///Uninstall
uninstall this by any Mod manager or remove this from your directly.

///How to Get this weapon
use the console command :
player.additem [Form ID]
if invalid error shown, search the form ID after use the help command :
help "zzzSPDualMeleeWeapon" 4
and use additem command by form id that are searched by above command.

xx004C67 "zzzSPDualMeleeWeapon01"
xx007282 "zzzSPDualMeleeWeapon02"
xx007283 "zzzSPDualMeleeWeapon03" 
xx007284 "zzzSPDualMeleeWeapon04"
xx007285 "zzzSPDualMeleeWeapon05"
xx00AF68 "zzzSPDualMeleeWeapon06"
xx00AF69 "zzzSPDualMeleeWeapon07"
xx00AF6A "zzzSPDualMeleeWeapon08"
xx00AF6B "zzzSPDualMeleeWeapon09"
xx00AF6C "zzzSPDualMeleeWeapon10"

///about change weapon graphic
this doesn't support weapon's graphic exchanging feature.
if want to change to other graphic, overwrite below nif file and put dds and bgsm.
Fallout 4\Data\Meshes\weapons\SPDualWeapon

Left:
for overwrite graphic, use the OutfitStudio etc.
Right:
for overwrite praphic, use the OutfitStudo and Nifscope.
about those tool, view the something web site.