I have a couple of Duo-Art rolls where the bridges of long chain
perforations have become folded or crumpled so that the hole (and the
roll) seems to be narrower than it should be.  Has anyone else faced
and solved this problem?

I might try the steam iron approach but thought I would ask before
doing it.  If I get the bridges flattened should I try to reinforce
them, or say every fifth bridge, with repair tissue?

Any help would be appreciated.

David Sharpe
Western Massachusetts