heat up the shaft a little with a torch, not to much, then put the bushing in as far as it will go, then push down on the arrow shaft while the bushing is on the floor( hard, not carpet). They are supposed to be snug to keep the bushing from turning. That should help some. You can also try a little soap on the bushing to help it slide in.

TAKE YOUR KIDS HUNTING AND YOU WON'T BE HUNTING FOR YOUR KIDS