Led using the right variation and managed to get my rope stuck on a block in the right-hand crack, despite extended efforts the rope had to be cut. it appears we were not the first party to have done this. note for the future: rappel the left variation.
"Got tight last night on absinthe and did knife tricks. Great success shooting the knife into the piano. The woodworms are so bad and eat hell out of all furniture that you can always claim the woodworms did it."