I have had a few suggestions since starting this blog. I really liked one of them that came from my son's teacher.

I found a small lock that was smooth and used shelf liner to attach around it. I will make some more interchangeable pieces to go with it.

Locks are easy to use and can help with fine motor skills!

Here are the pictures.

I will try to find a larger lock as this one is relatively small and might cause frustration.