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How to re-visit on spine testers

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Lombard:
Not stupid Natty, if we were born with all the knowledge we needed to live, we would have been born reptiles. Doctored photo should give clarification. As the arrow flexes under the weight, the needle reflects the amount of deflection on the chart. It will need to be tweaked to get it dead on accurate, but you can see how it will allow you to group arrows by spine.

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Orkraider:
I have to say, that's about the simplest and slickest looking spine tester I've seen so far.

Now, Just so I know, the rests or nails are normally 26" apart, for a 28" arrow, and the weight is 2 pounds, yeah? 

can you simply measure the spine in inches of deflection if you haven't put the needle and chart on?

And is it the case that somewhere there's something that says what the spine is in weight for amount of deflection in inches?

I'm assuming that deflection is the right word.

Lombard:
Orkraider, in the last issue of PA there is a chart that has a spine chart and gives the numbers in deflection values. Pat gives clarification on the standard for twenty six inches, in his post above.           

Orkraider:
sweet, I"m going to have to look for that.  I"m hitting the book store this afternoon, hopefully they have that in their back issue stash. 

I did find a formula that says, for spine in pounds, divide 26  by deflection in inches.
 
So, if I have a shaft that deflects .5 ", that would be 52 pounds.

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