We use the Tour Set every day in our production and we have not seen any problems. Without having it here to test there is no way of knowing why it failed. I can tell you that 99.9% of all epoxy failures we see come from either it not being mixed properly, the hosel not being cleaned and allowed to dry properly or not enough epoxy being used. Did you keep the excess when you mixed it, assuming you mixed it on a piece of cardboard, a mixing board or something similar? We always recommend doing that so you can see if it sets up. Two part epoxies need to be mixed thoroughly before application. That being said, it could be something with epoxy, although we have not had any issues. We can send you a replacement if you would prefer. You would need to contact customer service and they can take care of it. If possible, I would like to get the cartridge you used (assuming it’s a cartridge) back so we can test. Customer Service can help you with that as well.
Very sorry for the inconvenience and thanks for letting us know about your experience.
What’s your cleaning process? I always wipe with acetone (on new heads) then use the sanding mandrel after. I’m a believer in doing it in that order, acetone, can leave a film inside the hosel.