There are a few videos on YouTube on the disassembly of the bolt but I haven't found one that talks much about the bolt face where the ejector is located at.
But you should be able to punch out a pin that holds it in place to access the spring and plunger, or what I call the plunger that ejects the shell.
Here is a PDF of the bolt. It isn't from a Storm but a 110 but it should be close to the same.
The bolt face is #12
The ejector retaining pin you need to remove is #11
Then the ejector spring #13
And the ejector #14
I got this off of Numrich Gun Parts web site
Get your Savage/Springfield/Stevens Model 110C parts and schematics today with Numrich Gun Parts. Providing rifle parts since 1950.
www.gunpartscorp.com