Fuel tank straps, add felt or rubber?

Here's an old post I made that will help you get the filler tube into the grommet. Now that I look at the pic I can see why I have a grommet leak. I wonder if I made the dimple in the pipe while removing it from the donor car...

Sorry if posted by someone earlier but I was having trouble pushing my fuel filler tube into the tank today so I placed a worm type hose clamp around the tube and used it to pry the tube into the tank using a screw driver at the edge of the hole in the floor. Had to reposition the clamp a few times to get it all the way in.

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