[Modding EFE tail light and some more questions]

On my first EFE I cut a section out of the bottom of the light and glued in a clear piece from another taillight but that was 20 years ago.
These days I'd do as Wraith suggested and use LED's

[Stop!! Well I hope to do so....]

Grease gun will get it out as Swiss Toni says. Have used that trick a few times, a little bit of mess to clean up but normally the relief of getting the piston out makes up for it.