US Patent 12123693 Arrow shaft weak spine detector

An arrow shaft weak spine detector may include a first plate, a second plate, a first shaft retainer in a second shaft retainer. The second plate is spaced from the first plate to receive an arrow shaft therebetween and is movable along a first axis toward the first plate to compress the arrow shaft. The first shaft retainer is supported by the first plate to engage a first axial end on the arrow shaft. The first shaft retainer is rotatable about a second axis coincident or parallel to the first axis. The second shaft retainer is supported by the second plate to engage a second axial end of the arrow shaft and is rotatable about the second axis.