Thanks. You sure seem to be a major reason why this web site is beneficial!
The new faucet has an adapter (plastic) that provides for threading the faucet on it over the copper tubing. I think I understand you to say that a)fully threaded b)teflon taped & puttied and c)copper end burr free should all provide for a leak free installation.
My problem is that the inner tube will not fully tighten onto the threaded adapter because of the hole created by the retainer ring screw. I must be doing something wrong because the instructions directed me to create this hole and clear out the excess plastic burr it created before installing the inner tube.
I have the original faucet back on after soaking it in vinegar and it is not currently leaking. Further, it is actually diverting to the shower head now. It would be great, however, to be able to change this out at some point!
Many thanks again for your contributions!