Originally Posted by Txomin
Thank you for the quick reply and please forgive my ignorance.
What is Tweak? I've been playing with ebook-convert.
highlight the book entry: Tap 'T'
This tool allows you to unpack the books pieces to allow (small) edits, then put them back together when done, maintaining the original structure. For Bigger edits( add/remove chapters..., Sigil is easier for the novice-intermediate).