Last week I bought a six pak of Horton carbon strike bolts and four of the six brass inserts have fallen out. The bolts go halfway thru the target and stop and the inserts keep going with my target tip and broadheads. I've looked all over for these brass inserts but noone has them. The bolts fly different with aluminum inserts because the brass ones give the bolt a weight forward feel. Does anyone know where to get these brass inserts?