I made a geoboard for my niece. This is how I did it.

Supplies (following these Amazon links and buying anything helps fund this channel):
#6 Wood Screws – http://amzn.to/2lwXpy0
Spray Shellac – http://amzn.to/2l1a5vb
Rubber Bands – http://amzn.to/2l9QQjW