Keep knives for vertical loop, then use the appropriate tools to dig, trim around the outer ground knife ring until near the bottom edge knife, stop, and press closed manually or use weights to make knife flooding 15 mm deep into the soil to 20 mm; Such episodic continue until the land office in mouth knife knife raised over about 5 mm to 7 mm, then stop. Noting monitor and ensure land cylindrical surface of knife round choice in the first bottom cushion angle of a range, to land not under tension. When using weights shut, must hold true to vertical direction, each hammer to force closed at that knife deep into the soil no more than 5 mm and not disrupt the structure of the soil.
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