If so, fine. This activity helps many children. Sit so that you can guide his writing hand. Make sure that only his index and middle fingers are extended, and that his eyes are closed. If your child is using manuscript, use that form.
Finger paints are messy, but ever so helpful.
Use oilcloth and a large table. Have your child roll up his sleeves and wear an old apron. Let him use both hands to write letters and words, It is a marvelous activity. Just gating the feel of large movements may be sufficient without introducing formal spelling to the activity. Let him make up his own codes for you.