Originally Posted by
Doremus Scudder
I don't understand the gap you're speaking of... If it is due to the warp, then a bit of woodworking/machining seems to be in order. But if the filmholders aren't covering the opening for some reason, I would think that they weren't being inserted properly. You may want to find a small-parts machinist or fine woodworker in your area and get their opinion(s) if you don't feel you have the skills and tools to deal with the problems yourself.
But don't despair! As my favorite mechanic once stated: "It's a machine; it can be repaired."
Good luck,
Doremus