Adding forgotten kernel module without complete recompile

[Klaus-Peter Schrage]

... the subject tells it all.
Now the module in question wasn't really forgotten, I didn't need it on 
my last recompile, but now I do: I have a very nice new device, a Mambo 
USB Music Drive which is a mp3 player and a 128 MB USB storage in one, 
as small as a lighter. It should hotplug in Linux as well as it does in 
Windows, so I need usb-storage.o which I had disabled on my last full 
kernel compile.
How could I get usb-storage working (on a stock 2.4.21 kernel) without 
the whole recompile story which I really don't want to go through?
This should be possible, and I faintly remember to have done something 
like that before ...
All the other necessary usb stuff is already there.
TIA Klaus