Updated the clicky switch that was posted in this thread (earlier), with a new and improved fairly easy mod, using the same switch as for the dorcy aaa light. This switch is available from digikey for $1.22 each.
This is a DPDT switch, but is only being used as a on/off setup (read the dorcy aaa link below, if you have questions).
Have not quite figured how to secure this switch in tailcap; will probably use silicone to hold in place. As you can see in pics below, I left the pin contacts "out" so they make contact with main body of tube. The center pins on this switch are touching the negative side of battery(as well as each other to increase the current capacity). This is a lot easier to mod this light for clicky on/off feature as NO soldering is needed; in case you decide to restore to original switch.
EDITED IN: THIS SWITCH ALSO HAS THE MOMENTARY/TEMPORARY ON WITHOUT ACTUALLY CLICKING IT ON.
It's no surefire clicky switch, but it operates the same way.
Dorcy clicky on/off: