| The Specially Designed Locking Cone Securely Centers And Locks Props Onto The Balancing Shaft For Utmost Accuracy. The Balancing Shaft Is Manufactured Out Of Hardened Material And Then Is Centerless Ground Giving Precision Balance. The Du-Bro Tru-Spin Prop Balancer Will Balance Model Airplane Props Of All Sizes And Weights, Boat Props, Spinners, Car Wheels, Helicopter Rotor Heads, Jet Fans, Fly Wheels, Etc. Each Balancer Comes Complete With Easy To Follow Assembly And Prop Balancing Instructions. Packaged In A Reusable Clamshell Blister For Storage. |