I recently purchased a IIIf BD with a guide to help trim the leader. The manual shows how it should be done. I did not have any problems loading my first roll since it's similiar to the Minox GT-X. I did not trim the leader on that roll and could not understand why I should. That and the other rolls I've loaded had no problems. Is it okay to load the camera just using the leader on current rolls of film instead of measuring the correct length as per the manual?