Most small planners have a single feed roller. If the in-feed or out-feed tables are not level with the knives you will get a snipe at the beginning or at the end of the board. If you are like me you can never keep the feed tables in alignment, so here is my trick.
The picture above is an 1/2" equipment foot turned upside down. Next I threaded a piece of flat plate, drilled a hole in the table top, attached the plate, securely. Added a wing nut for a lock nut.
Place a straight edge in the planner, (disconnect power) lower the planer head until the roller is firm against the straight edge; adjust the equipment foot until the feed table is firm against the straight edge. Works Great. You can still get a snipe on long pieces unless they are supported.