I'm looking for a chapter book that I read when I was ~9 in the early 80s. It's about two kids (boy and girl) who find a magic pencil that changes things to whatever they write. I think they get it from a handyman that uses it to change the length of his ladder, the type of cookies in a box etc. They change their size to 4" and have adventures. I remember a chase with a cat and them visiting a cave of some sort.
Mostly Magic, by Ruth Chew.
https://ruthchew.com/about-the-books/Mostly-Magic.htm
Wow,
That was fast.
It was indeed “Mostly Magic”
Thanks
guy
You’re welcome.