Go watch the video and listen to it. Pause it. back it up and watch it again. Repeat untill you are sure you have the direction of turn with associated voltage down. It took me about 6 times.When you are SURE you have it down come back and post. I'll be interested in your observations. Your answer will prove your observation skills and integrity.
I still haven't been able to get audio, but here's my notes:
:37 fuzzy but meter appears to show 5.59?
:40 appears to turn counter clockwise
:43 meter reads 5.78
:46 appears to turn clockwise
:48 meter reads 5.42
:49 meter reads 6.65
:51 half turn counter?
:55 meter reads 5.51
:56 turns clockwise
:57 appears to press on it
:58 turns counter
1:01 meter reads 6.65
1:04 turns clockwise
1:06 meter reads 5.38
These first few attempts are difficult to determine exactly which way he is turning because the nature of web video makes it a bit jumpy and in most cases he only turns for a second or two.
I admit these results are somewhat inconsistent but since I was not actually there I cannot state for certain at which points the cap was screwed tight and where it was not. I do note that at :55 the meter is showing 5V (which we would presume means the cap is on tight) but after turned counterclockwise at :58 it shows 6V at 1:01, a clockwise tightening at 1:04 gives a 5V reading next.
1:12 removes cap
1:14 adjusts setscrew
1:19 replaces cap (turning clockwise)
1:25 meter reads 6.67
1:27 turns counter
1:29 meter reads 6.65
1:30 turns clockwise until it appears it will not turn further
1:32 meter reads 6.65
1:34 turns counter
1:35 meter reads 6.65
This portion is especially interesting to me as he has reproduced the results of the 7.4V test. By doing whatever he did to the setscrew, the Xhaler puts out 6V no matter which way he turns the cap.
1:38 unscrews counterclockwise and removes cap
1:42 readjusts setscrew (meter shows activity)
1:47 holds dental pick across base, meter shows 6.65
This part is fascinating and quite telling: After he readjusts the setscrew so that it makes contact with the dentists pick and the setscrew, the circuit is closed (without pushing the button) and running 6V, without the bottom cap even attached.
1:54 replaces cap clockwise
2:00 meter shows 5.46
2:02 turns counter
2:05 meter shows 6.65
2:07 turns clockwise
2:10 meter shows 5.26
2:11 turns counter
2:13 meter shows 6.65
2:15 turns clockwise
2:17 meter shows 5.42
2:19 turns counter
2:20 meter shows 6.65
And this final section is the smoking gun as far as I can tell. It seems very clear to me that after he tightens the cap with a clockwise turn, the voltage drops to 5V, but if it is loosened by turning counterclockwise, 6V operation is resumed.
Up to the one minute mark it is somewhat confusing, but it just kind of looks like he forgets which direction to turn next or he might be loosening it with a counterclockwise turn, but not so much as to break contact with the setscrew...I don't know for certain, but I think Occam's Razor should win the day: What are you going to believe, some inconsistent results prior to being adjusted and then working exactly as advertised that could be explained by any number of testing errors or simply the fact that we aren't seeing it correctly, or do you think that somehow Ohm's law went into reverse for a few seconds only to return to normal after Drew fixes it?