Im having the same issue. To elaborate on the problem, it wont work in VAB. Attaching a Harpoon or any other Hook via the Kerbal Iventory in EVA works flawless. Steps to recreate the problem: 1. New install of Kerbal Space Program v1.0.2.842 2. Put KIS v.1.1.4 and KAS v.0.5.0 into the GameData Folder 3. Lunch KSP and start a new career 4. Go into the VAB and select any Structure and attach a winch to it 5. Try to attach a Harpoon to the just added winch 6. ... @KospY Love the mod thanks for the update small problems wont keep me away from it.