I'm guessing that that's not an issue if you want to fit and face it. (The link doesn't show correctly as Jetlink pointed out but I can kind of guess) I'm not an expert, but from what I understand it's not the act of putting the coupler on the shaft that will require a new one, it's running the coupler on the shaft for a time. I can't see that fitting and removing a coupler will make it loose on the shaft, which is why we normally replace the coupler when it's removed. ie, if it's not a tight fit, then it needs to be replaced.