Canadian maker? Unique joint? I'll make a guess and say we are talking about one of my cues? Experiencing a problem with a cue is something possible (and that goes for any cuemaker). Now speaking for myself, as far as I can remember, I have always stand behind my cues and have never been ashamed of admitting a problem (fortunately there aren't too many as someone else suggested). That's why I always fix a problem. Especially in this case, if the shaft arrived warped than it's not even a matter of discussion. I wish the person would contact me directly so we can discuss the matter.
Now as far as the forearm joint being problematic I have seen this problem happen once because the person actually broke himself the cue by hitting it. Our forearm joint cannot be unscrewed since it is not screwed. The joint is made of a maple cone glued onto a female cone under the wrap section. It is either undone or together, there's no in between. My cues have a reputation for being very good playing cues, I will surely not let isolated problems like this one ruin this reputation.
Thierry Layani