I have used Lansky sharpeners since ~1985 and worn out at least three conventional and two diamond sets.
Tip number one, the stones have two sides, when one side wears out carefully remove it, flip it over and hot glue it to the handle. I used boiling water, it was too hot and warped the holder so be careful.
Tip number two, lay the stone holder on a flat surface and tighten the thumbscrew securing the guide rod, then tweak the guide rod so it touches the flat surface.
Tip number three, took me twenty years to figure it out, use the thumb screw to set the jaw angle to be parallel to the blade and then a Phillips screwdriver to tighten the clamp and it won't slip as much if at all.
Tip number four, and it has nothing to do with the Lansky. For shaving sharp, strop the blades. There are commercial (expensive) versions but for about five bucks, you can pick up a bag of leather at Hobby Lobby in BCS, similar places in other locations, and a few feet of 1x4, I used Red Oak and glued the leather to the boards. I used four different colors for different rouge on two boards, I believe the rouge was purchased at HD or Lowes.