It looks like it’s only held on with three screws, what gives? December 4, 2017December 5, 2017 by jbmg40 jbmg40 No comments yet 635 Nope, don’t worry. There is definitely a full complement of four. Revolva does have an unusual cantilevered design allowing for the cartridge to be inserted. Post navigation Can I use more than one cartridge at a time?I have a behemoth of a lens, how strong and stable is Revolva? Leave a Reply Cancel reply Your email address will not be published. Required fields are marked *Comment Name * Email * Website Save my name, email, and website in this browser for the next time I comment.