We bought these books and have learned how to hold a pencil.
We then explained to our son. Although he did not want to do small exercises of the book, we kept him "hammering" the need to take his pencil like a little rabbit with the help of diagrams the book. In three months he had changed his outfit pencil and 4 months perfectly well held his pencil. With the help of the nanny we stressed and have never rained left holding his pencil as he did in the past. All that is ancient history and now holds his pencil like a big. This book helped us to help bcp.