Any hot tips on replacing gas tank filler tube grommet?

I just replaced mine on the Barracuda. Greased up the outside of the tube and a little inside the grommet and she slid right in. Nice and snug.
SAME HERE, EVEN PULLED THE TANK TO ADD REAR FUEL OUTLETS, AND RE INSTALLED IT W/ THE TUBE IN THE CAR. USE LUBE OF UR CHOICE . Dam cap lock !