( double speargun can be crafted with the following recipes

Autolearned
Player Recipe
Primary skill used: mechanics(4)
Required skills: fabrication(2)
Time to complete: 90 minutes
Tools required:
> 1 tool with metal sawing quality of 1
> 1 tool with screw driving quality of 1
Components required:
> 3x plank OR 3x heavy stick
> 8x rubber hose
> 6x scrap metal
Byproducts:
(none)