If they don't spin right, they won't fly right! The Arrow InspectorTM is a precision instrument designed to help insure a smooth and accurate arrow flight. As bows increase in speed, accuracy becomes more and more critical. Use of the Arrow Inspector will increase accuracy and is essential when gluing outserts/ point adapters on carbon fiber arrows. The Arrow InspectorTM will check, with precise accuracy, arrow shaft straightness, broadhead balance and straightness, nock alignment and vane and feather balance. The Arrow InspectorTM features low friction machine cut steel axles and precision cut aluminum wheels - to detect even the slightest bend in an arrow shaft or unbalanced arrow. This tool is essential when gluing hidden inserts, outserts and nocks on carbon fiber arrows after applying epoxy so they can be easily aligned for perfect balance every time.
The concentricity of the arrow and the correct positioning of the tip influence the accuracy of your arrow's flight to a large degree. Especially with carbon shafts, concentricity is a vital point, since it is one of the biggest problems in the production of carbon shafts to build the arrows as straight as possible. With the Arrow Inspector you can check the concentricity of your arrows and sort out the "crooked" ones
For mere info se video:
https://www.youtube.com/watch?v=CqMuWrrIDfw