Atomarc, I'm not the brightest bulb in the chandelier, so I often run into problems where others don't. A 15 minute task? I don't remember how long it took for us to install the tube when the engine was on the stand, but it would take a lot longer than 15 minutes when the engine's together and in the truck. It involves removing the head, the rockers, etc.
anyway, I don't believe the leakage is occuring between the tube and the ferule. I think (it's hard to see down there) that it's coming through the threads between the fittings. I've got the inner (male) fitting out, and I'm going back out to take out the outer fitting shortly. Maybe then I'll see something out of whack. Then perhaps I can whack it back into whack.
Jed, the leak slowed down quite a bit once I made my little teflon rope, but I also put the teflon on the threads at the same time, so who knows? If I can, I'm going to remove the teflon altogether and use some kind of thread sealer.
Somebody hold my feet, I'm going back in....