Most of my reps are of the 7750 variety. I have read where the Zig suggest not hand winding the 7750. I have never wound my 7750s and just give It a few shakes set the time and off I go. I have not had any problems thus far. The question Is ??? " Is It OK to wind my 21J or 23J movements". I know that they are a more robust unit then the finicky 7750. I dont think there should be a problem winding these movements but I want to make sure. I normally dont really think about the stored energy. My new watch Is the Ulysse Nardin 45 Maxie diver with power reserve. I am now very much aware of the power that the watch has remaining. When I received the watch yesterday I gave It a few swirls like a brandy snifter, set the time, and put on the watch. It's holding at about 60% PR, not bad for just wearing the watch. I try to take great care of my reps and gens. Im thinking that this would be good Infomation for anyone who feels like I do. I know that this Is more of a noob question but there are a lot of noobs here Including myself. Thanks In advance for any Info one might have, Mike