Just had a few questions regarding the film presure plate on Canon camera backs: 

     1) How sensitive or fragile are they? I ask because I somehow held the back of my 
camera and ended up grabbing the back with my palm on a portion of the pressure plate 
and my fingers behind the camera back.

     Visually, it looks fine but was just wondering if this is likely to cause any 
problems, misalignment etc? I didn't     put much pressure on it as I let go when I 
realized what I had grasped and it looks flat. Just how sensitive is it and how 
problematic is touching it? 

     2) In the same vein, I have seen recommendations for putting tape on the pressure 
plate when doing IR photography if you have the 'dimpled' type of plate. How likely is 
the pressure etc of placement of something like this to causing damage? 

     3) If you see a small stain on the plate should it be cleaned or wiped off, and 
if so how and how delicately?? 

     Thanks. 

Howard
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