At one time I was going to make a swingweight measurement tool. I was going to use it to measure the period of a racket swinging from a pivot but things got in the way and I dropped the project. Talking less than $10 if you have an iPhone, iPhone etc. Interested?
EDIT: You could also use this for baseball / softball bats and other swinging instruments.
Everyone has the right to be stupid... it's just that some people abuse the privilege
Last edited by Irvin; 02-25-2013 at 04:40 PM.