setting group permissions to write zope-owned files? (FC5)

Hi, I'm trying to  figure out how a user rj2nagle can
write/edit files 
inside directories owned by another user zope with group
named "zope'. 
I'm using FC5, which apparently employers User Private
groups.


/etc/groups
rj2nagle:500:
rj2nagle
zope:101:
rj2nagle

If I run usermod -g rj2nagle -G rj2nagle,zope rj2nagle
I would think that it would let me edit files that are group
writable. 
But I can't do it.  if i run
[rj2naglelocalhost products]$ groups
rj2nagle

Here are the permissions in the directory i want to write to
as rj2nagle:
drwxrwsr-x 2 zope zope 4096 Oct  9 12:29 .
drwxr-xr-x 7 root root 4096 Oct  9 01:49 ..
-rw-r--r-- 1 zope zope    0 Oct  9 04:33 mine
-rw-rw-r-- 1 zope zope    0 Oct  9 02:39 test
-rw-r--r-- 1 root zope    0 Oct  9 12:29 test2

If rj2nagle is a member of the zope group, you would expect
to be able 
to edit the "test"file. But it can't.

I know this is an issue with user private groups. 
http://www.re
dhat.com/docs/manuals/linux/RHL-9-Manual/ref-guide/s1-users-
groups-private-groups.html
But I can't figure out what I'm supposed to be doing. Surely
I don't 
need to create yet another group that both zope and rj2nagle
need to 
belong to?

Call me very confused.


Robert Nagle
Houston, Texas


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