Njira ndi njira zothetsera kupukuta kwakunja ndi izi.
① Onetsetsani kuti ma billets ndi abwino. Sipayenera kukhala ming'oma ya subcutaneous pamwamba pa billet, ndipo khungu lozizira, indentation, ndi ming'alu pamwamba pa billet ziyenera kutsukidwa, ndipo m'mphepete mwa poyambira pambuyo pa kuchotsa kuyenera kukhala kosalala.
②Pamafunika kuti notch ya mpukutuwo isakhale yozama kwambiri kapena yotsetsereka, ndipo m'mphepete mwa notchyo ikhale yosalala.
③ Sinthani moyenerera njira yodutsa ya makina oboola ndi mphero. Ngati pamwamba pa mpukutuwo wavala kwambiri, ayenera kusinthidwa munthawi yake.