Where to get an overcharged capacitor for just a few more things?

Where to get an overcharged capacitor for just a few more things? 

Notes
  • [Crafty’s Tools] are located underneath the Fizzcrank Pumping Station.
  • [Overcharged Capacitor]s can be created by any 375+ engineer.
  • [A Handful of Rocknar’s Grit] is looted from Rocknar, located just west of The Wailing Ziggurat.