[Zope] threadlock module import error

[Henk]

I have a zope server 2.10.2  running. After upgrading to a 2.13.4 
version of Zope and importing a .zexp folder from the old version I get 
the import error: No module named ThreadLock.
In version 2.13 the module ThreadLock was removed it states in the 
changes description.
What can I do to make it work again?
*
*-- Henk Laloli
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