Weight tubes questions

[inthebox30lbs]

How much does adding weight tubes affect the spine of arrows.  Id like to add some to my 35/55 gold tips.
scott

[Big Sneaky]

I never could tell the difference when I used the 3 gpi tubes in Gold Tips.  Tuned the same with or without.  It may effect the spine if you use some of the heavier ones, but I don't know first hand.  You may get more response if you ask this in the POWOW forum.

[Korak]

I've used the 5gr in 3555 GT arrows, the spine was not changed as far as I can see. I'm pulling 45@26".