My Dell X1 (tiny precursor to the netbook) has lost four of its seven rubber feet over time.
Last year, I decided to do something about the wobbly typing stance this presented:

Hot Melt Glue !

Seriously!

It takes only a few seconds (after a 4-minute warm-up wait),
and.. voila. Fixed. Better than new.

Just blob it on in place of the original (missing) rubber pads.
It looks better, and performs brilliantly!

If you muck it up first try, then just peel it off and have another go!

Try it!