I have some but not applied any as yet.
I think they come from the stable with loctite on the pivot, all the new XM's I've purchased came that way.
My fav XM - the spanto has been cleaned several times and has a clean and un-loctited pivot - it does slip though and loosen after a few hard flips, a quick adjustment with my thumb gets it back in seconds.
I keep it that way for scale swapping - gives the knife a whole new feel and my "grass is greener on the other side" syndrome has me changing scales too frequently.
If I can ever decide to keep one scale on my EDC longer than a week I will likely use locitie to keep the pivot at the sweet spot once I've dialled it in