I checked my shaft after your reply, looking to see if I could remove the initial joint adapter, but I didn't see any seam. I emailed Seyberts.com and confirmed they had installed a permanent joint to the shaft, so it's a no go.
Thanks for the information anyway. If anybody is interested Seyberts.com is selling the remainder of their stock for $125. They have a 5/16th x 18 piloted joint, a lucasi quick release joint and a two striped quick release joint (generic? I don't know).
Even though it didn't fit my tempest cue, I was fortunate enough to have a lucasi hybrid with a wood to wood quick release joint to test the shaft. It's too bad they got bought out (by Lucasi?). Nice shaft. Firm, medium hit with a small amount of give at the end. No vibration, even at high stroke speeds and was fairly light. Very accurate. A bit more so than my hybrid shaft, which is the same design except for the carbon or some other reinforcing fabric material at the bottom of the shaft, that is missing on the hybrid. I think it's a better shaft than the hybrid, though to be fair, the hybrid had a 5th ave tip that I installed off of another cue ( not a repair man) and the universal claimed to have a moori on it from Seyberts. Looked a lot darker and I thought it hit different, but was a very nice tip either way.
Thanks again for your help. Much appreciation from a newby poster.
Luong