I had a nice conversation with someone at Packard who is familiar with both the Glaser and the Vicmark and he felt that the screw is equivalent to the Glaser. One thing that moved me over to the Vicmark is the fact that it has a steel body vs the Glaser's aluminum body.
John, I'm okay with the dedicated 1.25 x 8 thread since I don't see me changing lathes anytime soon. The guy at Packard agreed with you that the stock screw has been fine for everything he's done, so Glaser's screw options became less of an issue.
Neil, I had seen the Vicmark Dual Screw Faceplate but, like the Axminster, it appears to be matched to their jaws and all my chucks are Teknatool. Nice to hear that you are good with their screw quality.
Again, thanks for helping me with this!