There's an easy fix for the sloppy tailcap on the Dorcys as well as a number of other lights that were not as smooth as I would have liked when I bought them. It's called "Damping Grease" and it's available from:-
William F. Nye Inc. (also called Nye Lubricants)
Box 8927, New Bedford, MA 02742
Phone: (508) 996-6721.
http://www.google.com/url?sa=U&start=2&q=http://www.nyelubricants.com/pdf/dgm.pdf&e=7418
They make it in several grades and it sells it in 1 lb. jars. One lb. costs about $20 and will last you a lifetime.
I applied a thin coating to the tailcap threads of a Dorcy 1AAA and the motion [of the tailcap] now feels almost as smooth as a Surefire. This doesn't really help the undamped push switch but it's a cheap fix for a common problem. Damping Grease improves the fit and feel or "perceived Quality" when used correctly.
The stuff I use for telescope focusers and the like is their "Light" Nyogel 764C. It's also what's used on the focusing mechanisms of binoculars to quiet the motion and eliminate backlash. You may want a slightly thicker compound if you prefer a more "predicable" motion. Be aware that the stiffest greases are Very Stiff indeed. They can work wonders or really gum things up if your not careful.
Everyone should be issued a jar of 764c at birth. Buy a jar, you'll find uses for it that you never thought about. You might also think about buying a jar of one of the more viscous compounds as well.
Try coating the inner components of a cheap entry lockset with the middle grade stuff and you'll think the quality (and price) just went up a couple of notches. Great stuff.
Al