Love this idea - re pinned would also be good for fine motor. Counting Activity Using a Geoboard from An Everyday Story Number and Letter Sequencing
play when waiting somewhere?
Saw these style boards on Oriental Trading for use as geometry boards. Wondered a diy hack. Use glue on bottom circle of thumbtack to secure it from being plucked out by little fingers. Sowdering About in Seattle: Toddler Busy Boxes