ORIGINAL: Len in Maryland
Other things that will alter what manufacturers refer to as true centershot, besides spine, are;
machining tolerances,
riser twist,
limb pocket to riser fit,
limb twist,
limb to riser fit,
cam lean,
idler lean,
axle alignment,
bearing/bushing failure,
string fatique/failure.
Archery equipment, an absolute science.
By the way, don't forgetthe human errors that can also cause centershot misalignment.
So so true.......lol.
Most Mathews that I have seen are going to tune somewhere close to 13/16" from the inside of the riser for center shot. That should be a good baseline for you.