Seaming process:
- Prepare under seam and over seam.
- Indicate transverse seam. Pull the angle bisector back to the ridge.
- Slowly pull the ridge upstand upwards, following the transverse fold formation. Press the transverse folds together and fold them over in the opposite direction to the angle fold (only at the overlap).
- Hook in the longitudinal fold and press shut.
- Press the overlapping tabs shut.
- Knock the transverse folds of the underlay against the transverse folds of the cover sheet.
