I have a whole bunch of old wooden 5x7 film holders, most of them in pretty rough shape. What do I need to do to get them operational? I know I need to re-tape the flaps, what tape works best? Would you advise taking them apart to clean the light traps? Also, at least one of them actually has the blackness wearing off of the septum to the point where you can see the shiny metal! What would I use to fix that, something like matte black spray paint? Any other tips or hints on getting these back in to service? Thanks for the help!