While working with the LP2, I've had to get used to the specific spots where the pinch rollers align with the grit rollers.
(On the MH and SC units, the grit rollers are all along the width of the machine, but with the LP2, there are set positions, and the pinch rollers must be placed at those points ONLY)
On the front of the machine, there are stickers marking where those points are located.
However, as I load vinyl from the rear, and lean over to place the vinyl, I decided that having marks along the top rail (visible from above) would assist me in sliding the pinch rollers so they come into contact with the grit rollers at those specific (1" wide) spots.
Pictures attached to see my method.
Hope this helps others.