Mainca PR-360 Manuel D'instructions page 21

Next, set the roller's height by loosening the knob (4) and moving the support up &
down with your hands. (see fig.12)
The gap between rollers (3) should not be aligned with the center of the silicon tip (X).
We recommend to align the bottom of the upper roller (3) with the center of the silicon
tip (X) to ensure the twist of casing. (see last fig. 12). Move the rollers up or down if
necessary for better results.
fig. 12