Here is a link to the official service manual for all the Steps System's, a useful resource for bodging and fixing
https://si.shimano.com/pdfs/sm/SM-SHIMANO_STEPS_US-000.pdf
This is the E7000 user manual:
https://si.shimano.com/pdfs/um/UM-79E0A-002-00-ENG.pdf
And the E8000...