Originally Posted by
roadcrankr
Not only that, but also the end that butts up to the axle includes a slot for a flathead screwdriver to firmly hold it to secure the small knurled nut.
Use a wire brush to clean up the threads, as well as a tiny bit of acetone. Then apply some red Loctite before attaching the same knurled nut.
Red, really? That doesn't let loose unless you apply heat. I've never used thread-locker there, though blue Loctite makes sense to me. It prevents loosening by vibration, and it releases when you turn the screw with a screwdriver.