jump
go on the roof and turn the wheel with your multi-tool.
its in the museum on mainstreet of steamworks island :)
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.
It's Steamworks Island #14th Island
(The solution is at the related question "How do you beat Steamworks Island")
the crab on steamworks island is next to the living quarters
The old vine is on the roof of the Storeroom building left of the Living Quarters. Use the steam exhaust fan to lift you to the roof. You will need the vine underground at the Hub.
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.
You go to Steamworks and head to the museum and there is the Deogen
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.
steamworks island
There is a video walkthrough at the related link below. There are written WikiAnswers solutions at the related questions, as there are for all Poptropica islands. (How do you beat Steamworks Island) (What is the walkthrough for Steamworks Island)