def METHOD_NAME(self, start, end, exptime, npass):
    save_diagnostic = True
    operate_shutter = True
    if self.helical:
        self.get_object_by_role("diffractometer").helical_oscil(
            start,
            end,
            self.helical_pos,
            exptime,
            npass,
            save_diagnostic,
            operate_shutter,
        )
    else:
        self.get_object_by_role("diffractometer").METHOD_NAME(
            start, end, exptime, npass, save_diagnostic, operate_shutter
        )