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Reservoirs don't have stiffeners...
Regarding the conical compression spring, if memory serves, it's in the bellow that also contains the accent (or crash) bellow. It's purpose, therefore, is to prevent the bellow from closing too far. You might also notice that the tension of the 'V' springs is different in the two reservoir bellows. According to the Standard service manual, there are 7 lb. and 8 lb. springs. The heavier springs go in the bellow without the conical spring.
While there are no explanations in any book or manual concerning any of the springs in the reservoir bellows, logic dictates that there should be somewhat of a balance in terms of the vacuum level required to collapse the bellows. So, as the bellow with the lighter springs reaches full compression, the moveable board runs into the conical spring.
Regarding the accent (or crash) bellow, it only reacts to sudden changes in the vacuum level. That's why the spring that holds it open is very light weight. As long as the vacuum level remains fairly constant, regardless of how low or high that level is, the crash bellow (which is actually a valve) doesn't react.
Regarding the felt under and in front of the conical spring, it's only purpose is to prevent noise. I would not suggest removing the conical spring unless it is loose. As I recall, it's held in place with horseshoe nails, and any looseness will cause rattling inside the bellow -which would be annoying. As for the felt that the spring runs into when the bellow collapses, in the past I have replaced that with a piece of thick flap valve leather. Here again, it's only function is to prevent tapping when the spring makes contact with the moveable board.
Here are some pictures of the crash (or accent) bellow in a Standard reservoir bellow. Click on any picture to see the full sized image.
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