This is my first Intructable. The way this came about was that I was trying to find plans all over the internet to build a Knex Sawblade as I didn't buy the Sawblade Thrill Ride set. So I had a go at building one myself I went through several different build to try and get it to work. The hardest part was trying to get the Wheels to spin the opposite direction to the arms, Then Finally success. If I get enough interest I will post a Step by Step on how to build this.