You don't put it anywhere. Like the keys for Sully's and the Bridge control, you open the door using the Steam battery. You just need the key in order to use the Battery.
the crab on steamworks island is next to the living quarters
get the crab from the living quarters
It is at the far left past the living quarters. It is covered by vines that have to be removed.
The "rope" is a coil of old vine on the roof of the , left of the Living Quarters. You need it underground at the Hub.
There are no windows that open inward on Steamworks Island. There is a skylight in the City Hall that can be opened with the Multi-Tool. You go out the hatch above Zack's room in the living quarters, to reach the Mech Crank on the vines.
They are both left of Main Street on the main scene of the island. Here is a general layout : Storeroom-Living Quarters / Garage-Sully's / Cantina-Museum / Hub / Botanical Research Lab
Just to the left of Main Street. The living quarters it above the shop.
Get the right attachment named the " Living Quarters Key" and solve it with the steam battery.
The Living Quarters are on the very left side of Steamworks Island, before you reach the Storeroom at far left. Here is the main layout : Annex-Living Quarters / Garage-Sully's / Cantina-Museum / Hub / Research Lab (Production Zone) You go to the Living Quarters to find the robot crab and get Sully's key. You can't get inside until you have the key, which is in a closet in the Production Zone, behind a monster plant. When you go there, bring the dirty beaker (museum) and the mallet (Sully's).
its the place where the people used to live. i wonder where they are......
There is a loop of old vine on the roof of the building at the far left of the island, past the Living Quarters. You should get it early because you will need it at the Hub.
The rope is a loop of coiled vines at the storeroom left of the Living Quarters. Jump into the updraft from the steam vent and it will throw you to the roof.