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You can cut carbon arrows twice and
still get your insert back,
if you're careful. You are right in thinking that you can't cut unless you do so after the insert, but if you still want that insert back you can get it out. Take a lighter, any lighter will do, and heat the cut portion of the arrow (the part with the insert in it) until the glue melts. YOu may want to hold onto both the end of the insert and the piece of arrow with pliers as both get really hot. When you think it's heated up enough, try pulling on both ends, the insert should slip right out. Wipe it off, and you're good to go.
*Disclaimer* Washington Hunter takes no responsibility for injuries including, but not limited to: Burns, cuts, scrapes, bruises, scratches, "boo-boos," fingers glued together.