It’s something I always do if I have to re-install strings at the bridge, having removed them, for instance, to examine inside the sound-box, or tidy-up a bit of pick-up wiring. I give the string a couple of clockwise turns before inserting the ball-end into the pin-hole and putting the pin back in.

I tell myself I’m somehow ‘helping’ the string to keep its tone a bit longer, but I’m not really convinced I’m telling myself the truth. However, I am sure it does no harm, so…