Ultrasonic Cleaner - if unsafe, why does John Brozek say it's safe?

[Val]

I guess I'll say it once more for clarification...
It is not advisable that you "dangle" the bracelet in the ultrasonic while it is "still attached" to the case. The bracelet must be removed! The ultra high frequency vibrations will travel into the case via the bracelet. Again this is coming from a watchmaker with over 20 years experience and has been trained by Rolex extensively. Why would want to subject your precision timepiece to unnecessary wear and tear? Just take the extra minute to remove the bracelet, besides, this way you can also clean the grime from between the lugs and from the end links.