sander the type that have stick on pads, to make new sandpaper pads for
these...
get some sandpaper/carburendum paper, draw the shape around the pad and cut
out the shape, then get some good adhesive that has a tendancy to become
tacky when drying, cover a thin layer on the back of the cut out and wait
till it becomes tacky then get some cotton wool and rub over adhesive and
let it dry out. ;-)

I know, you can buy the real stuff ,but innit dear.
Dunno whether this has been submitted in the past?

--
Sir Benjamin Middlethwaite