I have been given a Microm 335E microtome. I do not have a user manual with it. Does anyone know how to turn the retraction on and off? Kathryn Stoll Supervisor Histology Clinical and Translational Research Core Lab Medical College of Wisconsin 9200 W. Wisconsin Ave Room 1176 Milwaukee WI 53226 Phone: 414-805-1525 Fax: 414-805-1528