I wish to give a big shout out to Madcow Rocketry for their fantastic customer service! I recently discovered that one of the main fins was warped. Somehow I missed it during initial parts inspection. So last Thursday morning I fired off an email to Madcow asking if the part was under warranty, and if not what the replacement cost would be. By mid afternoon of the same day, I received a reply stating they had shipped out a replacement. I received the fin Yesterday. Thank you Madcow!