Getting Avahi devices to show up in Finder with a customized icon

We have a device broadcasting out its model name "DeviceX" on the network:
<?xml version="1.0" standalone='no'?>
<!DOCTYPE service-group SYSTEM "avahi-service.dtd">
<service-group>
<name replace-wildcards="yes">%h</name>
<service>
<type>afpovertcp.tcp</type>
<port>548</port>
</service>
<service>
<type>device-info.tcp</type>
<port>0</port>
<txt-record>model=DeviceX</txt-record>
</service>
</service-group>
According to this thread http://forums.macrumors.com/showthread.php?t=458047, on my Snow Leopard Mac I've copied our DeviceX icon .icns file into /System/Library/CoreServices/CoreTypes.bundle/Contents/Resources . And then I'm supposed to add an entry into /System/Library/CoreServices/CoreTypes.bundle/Contents/Info.plist to map between the DeviceX model and this icon file so this custom icon will show up for our device in Finder. But there aren't any details for how to modify Info.plist to do this. Any help would be appreciated. Thanks!
Mark

Thank you VERY much!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Got it to work. However, my TOC will not update with the new building blocks.
Have played and played with it. Any suggestions?
Thank you!!!!!!!!!!!!!!!!

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> I am currently working on a program that reads the voltage off of a
> system with a pulsitile quality. The hardware is not national
> instruments (I know, not smart, but) so I am taking all info in blocks
> that cover 3 seconds so I can preform some averaging and frequency
> checks on it. I want to graph the information over a given period of
> time but can not get it to go under the proper time. Property Nodes
> have not worked correctly as I have followed the example in
> Fund>Charts>Realtime chart. Even with a max of 30 and a min of 0, the
> chart is ranging 30707 seconds and increasing exponentally. Per Scan
> I am taking 600 samples and running at 200Hz. Any ideas on how to fix
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Getting Avahi devices to show up in Finder with a customized icon

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