"Jerry" wrote: (clip) You could probably get good enough
accuracy of the "weight needed" to compress your springs some "given
distance" by placing the spring on a postage scale of the appropriate
sensitivity and push down on the spring . (clip)
^^^^^^^^^^^^^^^^^^^^^^^
Theoretically. What will actuaqlly happen is that there will be too much
vibration. Both the length and the force will be bouncing around so much
you won't get good readings.