M501 – Transverse bore with spring return Gallery M501 – Transverse bore with spring return M501 – Transverse bore with spring return
M502 – Transverse bore without spring return Gallery M502 – Transverse bore without spring return M502 – Transverse bore without spring return
M503 – Longitudinal bore with spring return Gallery M503 – Longitudinal bore with spring return M503 – Longitudinal bore with spring return
M504 – Longitudinal bore without spring return Gallery M504 – Longitudinal bore without spring return M504 – Longitudinal bore without spring return
