OK, after three hours sleep I decided to try this again. Someone call the stupid police!! Because I haven't changed batteries yet I forgot this was a three piece unit, the head, middle battery tube and tail cap. I was thinking the head and body tube were one piece because they were fully tightened and I was only adjusting the tail cap tightness. I fully tightened the tail cap and loosened the head and it finally went from Turbo/strobe to one of the lower modes when I twisted it.
Whew, what a relief. I'm glad this worked out. I'm heading to Ft.Lauderdale in a few weeks and was getting worried about my favorite EDC not working for the trip.
Kids, let this be a lesson to you all. When all else fails, read the instructions!
Thanks for the tips guys, and happy Victoria Day / May 2-4 weekend to all my fellow Canadians!