Pass thru, yea I still have them, hence the reasoning for staying with those heads.

Mark, see, I got your wheels turning!!! There usually isnt too much trouble with fp's, probably cause as stated the shorter length, but I bet also do to the material. There is one broadhead that has failed my spintests miserably, more than any other brand, but to save face, and not get jumped on by many I won't even Mention their name. Hint, Hint.

I am the type of guy who just can't leave well enough alone. I always have to tinker with stuff, to see if I can change/improve its design. In my fishing business, I am constantly making lures to have that something different, that no one else is throwing. I used to be really anal when it came to purchasing all my new bows. I used to drive my buddy crazy, cause I would show up with a micrometer and thouroghly check each bow out. There is human error everywhere, you just have to be able to look for it.

I second Flip13's remark on the GR's. Just screw in and then test them out. The only thing that will change ever so slightly is the balance point or FOC. If the bow is set up mint, with the center shot perfect, little or no adjustment is needed. Bullet holes thru paper will ensure good results.

Jason