Kyle, it is a 2016 xx75 shaft that I used for the footing, and now heading ?. They fit the carbon express heritage 150's perfectly. I have to use other aluminium shaft diameters for different arrows. I just lightly sand the outside of the shaft to match the length of the footing. I put the footing on the shaft, put a small amount of JB Weld an inch or so above end of the shaft. I slide the footing down spinning it and moving it up and down a few times to distribute the epoxy. I usually put the insert in at this time also. I clean up any excess epoxy with denatured alcohol. I think there might be a pictorial in the how to resources. I just eye the length, usually about an inch to inch and quarter. the nock ends i cut at about 3/8".