Trouble with set screws!

[bdebde]

Not all set screws are equal. If it is just flat on the end, it will come loose easier because it will just press against the shaft. The kind you want have a dimpled or cupped end on them, they will actually bite into the shaft and hold much better. Old locktite may not set up, and even fresh locktite should sit overnight or 24hrs + would be better.