Hi I am new to this forum. I have recently invested in a new mft/3, ts 55 req and ct 26. I initially set up both the fence and guide rail using a pair of qwas dogs and everything squared up. I then attempted to set up the guide rail using the factory stops or "feather keys" and in the factory position it isn't square with the fence. I then adjusted the fence to the guide rail (as per festool instructional vid) so they are square with each other, but they are not square with the holes in the table. This wasn't acceptable so I then loosened the fence again and squared it with the holes in the table using the qwas dogs as I had done initially. I then loosened the hinged end of the guide rail and moved it a few mm into square with the fence and all seems to be square. I will be removing the guide rail frequently so to make this repeatable It seems to me i should loosen the "feather key" on the hinged side and slide it against the guide rail and tighten it in its new position prior to removing the guide rail. Before I move the factory stop I figured I would ask for advice as I am not a pro millworker or a math genius. I am also curious about the size of Allen wrench required to loosen the feather key? thanks!