This site: http://www.southbristolviews.com/pic...icmanuals.html has a service manual for the top RF Pacemaker, but I suspect the rear shutter info will be very close to the same as your camera. It is a PDF file, so you can enlarge the pages on screen. http://graflex.org/helpboard/viewforum.php?f=1 may have the answers to specific questions on shutter service if you want to take time to look through all the posts.

Len