I broke a Graflok back for a later model (top rangefinder) Crown Graphic 4x5. The two metal "handles" on the focusing panel which is part of the metal surrounding the spring is broken. It looks like it could be repairable IF the right parts could be located which I doubt. The question is could I put a regular back from an earlier (side rangefinder) version Crown Graphic 4x5 on the later model? It looks like only two screws would have to be removed to get the back off the older camera and 4 screws to remove the "frame" of the Graflock back off the newer camera. If anyone knows for sure if this can be done or not and/or whether the job can be done by a non-professional please let me know. A guy selling a Graflok back on ePay is suggesting the Graflock back may be used to "upgrade" from a standard back on older Crown Graphics. I notice that there are NO regular nonGraflock backs listed for sale. Thanks in advance for any insight. BTW- The spring on the non-Graflock back seems to be stronger and tighter than the Graflock which is fine with me.