Need some help identifying the correct size insert for an easton aluminum shaft. In using a 2215 shaft as a footing over a 2016 aluminum shaft for some bullet proof stumping and bunny arrows. The fit is perfect. I usually cut the footing about 2.5 inches and and use the insert in the 2215 to accept the field tip or judo. The insert in the 2215 acts as a stop when slide over the 2016. I just looked on the Lancaster site for inserts and 2215 was not listed. Can someone tell me what other size insert would be compatible for 2215?