After the excellent response to the router base question, I now know I need
some Countersunk Machine Screws.

Got another question for you all,
How do I remove the springs from this router?

I've looked and can't see how it's actually held together.

The main body is half plastic, half metal. Don't see how to get these
appart, can't see any bolts that are holding them together. I can take off
one panel where the power switch is and I can see the spring (on one side)
but I can't get it out. The other side is sealed.

Looking at the bottom of the router, after removing the base, I can see
inside the pillars. One has some kind of round clip with two little holse in
it (circlip?)
The otehr pillar doesn't have one of these as far as I can see. I'm a little
nervous about removing this clip as I'm not sure what will come off and if
i'll ever get it back on

Any thoughts?

Thanks.