Tips for filler neck gasket replacement?

[Township21]

Hey all ,

I have a stock '72 Chevy C10. I am trying to replace the exterior gasket on the fuel filler neck -- without taking out the filler neck itself. I looked in the service manual for instructions, for 'how to' videos on YouTube, and threads here in the forum, and haven't found anything that helps.

Any one know the best way to do this, or can point me to a website or video that shows how to do it?

Let me know -- thanks!

Township21