To begin, take a cordless drill with a torque booster and an increment core. After selecting the coring position, place the corer perpendicular to the growing axis of the stem. Then start coring until the core reaches at least half of the stem diameter.
Check the depth by holding the extractor alongside the core. If using a cordless drill, remove the drill. Place the handle on the core.
Take the extractor with the open side facing upwards and insert it fully into the core. Then turn the increment core backward one full turn to break the core off the stem. After that, take out the extractor, including the core.
Now remove the core from the extractor. Check the fiber direction of the core to ensure an upright orientation when placing the core in the holder. Afterward, place the core on top of the holder with the fiber direction upright.
Press on top of the core with all fingers until it slides into the holder. Using a soft pencil, label the core on the side of the holder. Place the holder with the core into the transport box, and close the cover of the transport box.
