Plant Press Rivets

[diana horton]

Can anyone tell me what kind of company (or an actual company!) would put
rivets in plant presses?  I have checked in local hardware stores and they
don't have any that are quite long enough (they need to be about 5/8"; the
longest I have been able to find are 1/2").  I've been told that pop rivets
would not be suitable.  In the presses that one buys from herbarium supply
companies, the rivets are one of two standard types (one copper with a
"head" ca. 3/16" diametre; the other brass with a "head" ca. 1/4"
diametre).  Everywhere I go, they tell me that these rivets must have been
done by some special machine -- but no one seems to know a company that has
such a machine.

Thanks!

-- diana horton

University of Iowa Herbarium
312 CB
University of Iowa
Iowa City, IA  52242