Ha! I got this one covered Arthur.

Axle to axle length can vary depending on normal string stretch as well as the amount of twists you put into the system to compensate for it.....as well as the set draw weight in any given draw length range.

Taking measurements on things like cam position, brace height, axle to axle length, etc... when the bow comes right out of the box is a very good idea....(side note...not always saying that bows are always properly built right out of the box but you have to start somewhere...)