Wet endpaper removal
STEP 1.
End paper soaked with water with a brush and covered with a bag.
STEP 2.
Initial endpaper removal.
STEP 3.
Final removal of leftover end paper.
STEP 4.
Clean and dried cover.
Summary
The photos show a cleaned, undeformed cover. For comparison, in one of the photos it is visible with the new cover, which gently coughed up after drying.