Soften cloth shutter

Nothing will fix it. The rubber coating has dried out and cracks. The only option is curtain replacement..
 
Nothing will fix it, at least nothing in place, and probably not even anything that old, brittle silk would survive (there are ways and means to de- and re-vulcanize rubber, but these tend to be too rough even for old cycle tires, unless it is purely for exhibition purposes).
 
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