Frequency Tip Weight with Built-In Laser
Finally, a perfectly balanced, 205 gram, frequency tip weight with a built-in laser and an internal long-life CR2 battery.
This handy and easy-to-use tool works great for floing shafts before assembly. Mount the tip weight on the shaft and turn it on.
Twang the shaft to start oscillations and observe the pattern. Rotate shaft to align the spine in the plane.
Look at the video and read more in the PDF