I have closely examined the crack in the frame. It is my opinion that there was a flaw in the casting causing the frame to crack at the flaw. There is a crack running forward inside of the dust cover cut and a discoloration that runs even farther forward. This flaw is something that can be encountered in investment casting. The only way to find an internal flaw is to xray the casting before you machine it. That would add costs to the item that might be too much to add into the price. This is the first flaw in any cast frame that I have encountered. We used to see some inclusions in the Caspian fames that were like little pits. I have never had a Caspian frame crack in the many years I have used them.
I sounds like TISAS is going to replace your Hi Power and that is good customer service. I would personally chalk this up to a random occurrence. Give them the benefit of the doubt and don’t give them a black eye with the publicity. I will let you know if I have proof of another cracked frame. If you report this in the media it will get blown out of proportion and magnified as the story spreads. Publicity on the social media can kill a company with the lies it will generate from those who just want to spread trash about anyone.