Njredneck: thanks for the pics! Looks good!
Q: you noted that the set up allows the ridge length to be variable....does the coupling allow you to lock the length at a pre determined state? Or does the interior piece stay in place just with friction? I would think that the load would cause the two ends to slide towards the center along the ridge pole (but I'm a pharmacist, not an engineer!).
BTW: the failure I experienced was actually at the threaded end of the galvanized pipe. The threading sheared off at the coupling. But, I just used coupling with no internal support like what you've described above.