Teflon Seal Installer Set equivalent ?

[krdiesel03]

The Rotunda tool is over $200 and the OTC is about $100. I have no luck using a 3/8 extension. Does anyone know is a equivalent?.

Using it on a 03 6.0 F-250

http://www.toolsource.com/teflon-seal-installer-d 90p3517a-p-109959.html