I should clarify the issue with Talley. The problem was a defective Quick Release screw. It wasn't unworkable, it was just "not right". I didn't examine it but my guess is that there's a slight barb or bend in the threads at the tip of the screw. For those unfamiliar with the mount, it is two piece for each base. The permanent mount and the detachable mount are exactly the same. The only difference is the cross bolt/screw that hold the ring to the base. The permanent mount requires a wrench to turn it while the detachable has a lever that can be finger turned. So when I got this set of mounts (two bases and rings) it came with four screws, two if it was to be permanent, and two with the lever attached for use as detachable. The two wrench screws threaded into the mount beautifully, as did one on the levered. However the final levered screw was very resistant to screwing into the mount. Just as if some imperfection at the tip of the screw was pushing against the thread. The screw would follow the threads but required pliers to get leverage to twist it.
I contacted the company and was told that the screw was probably defective and if I returned it they would see if in fact it was and if it was, they would send a new one, but that by screwing the screw into the mount I would have damaged the threads, so that was my fault and they wouldn't replace it.
So I still have the mount and screws. If I decide to have a scope on a permanent mount, I'll use it, but as for a detachable mount all that I have to do is look at it to know I won't be using a Talley.