As you can see you don't have to go to a whole lot of expense to construct these and you'll get a lot of use from this simple design. Click over to our Ag Mechanics lessons and teaching materials and see what's there that can help your students during class.Good luck with this and please let us know your thoughts. Please follow us on Facebook, Pinterest, and Twitter. Send us your Facebook, Twitter, and Pinterest handles and we'll be glad to follow as well. You can also contact me at brian@onelessthing.net