( repeating crossbow can be crafted with the following recipes

Player Recipe
Primary skill used: fabrication(3)
Required skills: traps(2), mechanics(1), archery(1)
Time to complete: 420 minutes
Tools required:
> 1 tool with cutting quality of 1
> 1 tool with screw driving quality of 1
> 1 tool with hammering quality of 1
Components required:
> 4x plank OR 8x stick
> 1x spring
> 1x long string OR 6x short string OR 300x thread OR 300x sinew OR 300x plant fiber OR 300x yarn OR 300x Nomex thread OR 300x Kevlar thread
> 20x nail
Byproducts:
(none)
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This recipe can be found in the following books when fabrication is at least the required level:
The Bowyer's Buddy (level 4)
The Swords of the Samurai (level 6)