Sure. You first straighten the neck as close to dead flat as you can with the strings on and tuned to pitch. Then you place the guitar on the pads. You can also lay a couple of protected planks across the pads to distribute the weight more evenly. The pads adjust up and dowm and in and out to accommodate different instruments. Then you clamp or strap the body down snug so it can't move. Then you position the rods snug against rhe neck in 3 or 4 places. If you have the dial indicators installed you engage them to the bottom of the neck about a full turn or so and zero them. Then you remove the strings. Using a rod under the headstock, you adjust it until the dials get back to zero. Now you do your fret level under simulated string tension instead of on a back bowed neck.