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Originally Posted by Doctordick
Well, I will agree with you up to here but from then on, I don't think you have thought it out so well. ...But before we conclude that description, we need to look at mass energy effects. 
False! The time passage for the traveler must be identical to the length of time he thinks it took to turn the stem. :naughty...
Does anyone out there argue with my comments? ...
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Well, duh! I argue with your comments. My model was based on different assumptions than you state above. I assumed the user moves the watch hand and then "triggers" the time machine. He ceases to exist instanteously at that instant and re-exists at the 5-minute mark (or however many he dialed).
But in the meantime, mass and energy must be allowed to conserve. The minimum solution (there are others yielding gigatons of explosive energy and then absorbing gigatons of ambient energy) is simply that his instantaneous passage through time carves out a "shell" of his bodily passage. This shell would behave much like a perfect force field.
If you are going to add more requirements, more assumptions, more constraints, then of course, the problem changes and another solution is needed.