Dale is correct, you do NOT need to use locktite on a S&W revolver. Smith & Wesson uses a very fine pitch thread SPECIFICALLY because fine pitch threads are more resistant to "shooting loose".
Unfortnuately, they don't seem to be using Torque Setting screwdrivers. BTW, these special screwdrivers can cost in excess of 50 dollars each so it may be evidence of some misplaced "penny pinching". The Automotive Industry has learned the cost of screws coming loose can far exceed the cost of equipping assembly workers with these expensive tools so they are quite common on automotive assembly lines. However, they seem to be missing in action at Smith & Wesson. As a result it's not the least bit uncommon to find screws shooting loose. All that indicates is that the screws weren't properly tightened at the factory, it does not indicate any need for locktite.
What you should do is purchase a set of fitted gunsmithing screwdrivers and learn how to properly tighten the screws on your revolvers. BTW, I take a less is more approach, meaning I will gradually increase the tightness of a specific screw until it just stops shooting loose and stop there. That way I don't end up with screws that are overtightened but I also don't have problems with screws shooting loose. Once you been through the screw snugging exercise often enough you'll develop a "feel" for how much to tighten a specific screw and won't have any issues with them shooting loose. However, I can't emphacize enough that you need to take the time to develop that "feel" and resist the urge to tighten a screw until it either breaks or jams.
Final note on the Ejector rod. Just like the screws this part won't shoot loose if it's been properly tightened. In addition the threads for the ejector rod require a good bit of "feel" in order to get the thread started without cross threading it. Because of this I feel that it is extremely foolish to use locktite on an ejector rod. You'll only create a future headache for yourself or a real hassle for a future owner. A much better solution is to learn how to properly tighten it and develop the "feel" required to do it.
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