Amateur's weapon repair kit is a tool in The Witcher 3: Wild Hunt that repairs 15% durability on weapons.
Simply drag the icon onto the weapon in need of repair in the inventory screen, or right-click on the kit and choose the item to be repaired.
Crafting Requirements 
It can be purchased from the following merchants:
- All blacksmiths except the one at Ardaiso Quarry
- Bram in White Orchard
- Merchant at Calveit Watchtower
- Merchant in Lindenvale
- Merchant in Midcopse
- Merchant by the road west of White Eagle Fort
- Merchant at the Isolated Hut on Hindarsfjall
- Quartermaster Eggebracht in Nilfgaardian Army Group 'Center' Camp
- Weapons merchant in Nilfgaardian Army Group 'Center' Camp
- Zoltan Chivay during The Battle of Kaer Morhen (dependent)
- Merchant in Stacheier
