In order for the TRAK stencil to be available to OmniGraffle it needs to be placed at a particular location.
If you bought OmniGraffle from the Apple App Store Apple require this to be:
If you bought it from elsewhere including the Omni Group store it will be:
Luckily the latest version 5 seems to look in both locations so the advice is to place the stencil in the newer location required by the App Store.
OR
![The TRAK stencil can be located under RECENT STENCILS] (https://sourceforge.net/apps/gallery/trakomnigraffle/main.php?g2_view=core.DownloadItem&g2_itemId=18&g2_serialNumber=1).
GraffleTopia is a site that contains lots of templates and stencils for OmniGraffle. The contents of the site are available to all 3 of the OmniGraffle applications (standard, Pro and iPad).
Tap on 'Search'. OmniGraffle for iPad will return the results:
![The results of a search for the TRAK stencil] (https://sourceforge.net/apps/gallery/trakomnigraffle/main.php?g2_view=core.DownloadItem&g2_itemId=31&g2_serialNumber=1).
If you like what you see tap on 'Download' to install it.
![OmniGraffle for iPad shows you information on the stencil first] (https://sourceforge.net/apps/gallery/trakomnigraffle/main.php?g2_view=core.DownloadItem&g2_itemId=28&g2_serialNumber=1).