I bought a Mamiya RB67 Pro S rollfilm back for my "new" 2x3 Crown. Is there a way to defeat the double exposure prevention on the back? Not that I want to do double exposures, but every time I take a shot I have to remove the back and poke a pencil tip into the top corner so I can wind the film. If I jam something into the hole permanently will the film winding still work properly? I still have my first roll of film in the back so I can't experiment with it right now.