Yes I could have made it out of a bit of MDF but I have dozens of these 3mm thick stainless steel disc that I got for $1 ea from a scrap merchant and some 20 mm diam SS rod left over from another project.

Rod is attached to disc via an M18 1.5 thread..
Disc1.jpg

3 strips of 10mm thick Neoprene medium density self adhesive foam as a soft backing and one of those stick on Loop and hook discs.
Disc2.jpg

Here we go, great for shaping curvedthings like spoons and salad servers
Workingdisc.jpg

Not quite as easy as it sounds, the SS disc was originally 160mm in diameter and would not fit in the jaws of my small MW lathe so I could drill and tap the centre hole. Got around this by approximating the position and drilled a 16 mm hole and then used an M16 bolt as a mandrel so I could hold it in the lathe to remove 10 mm off the edge of the disc. While doing this great long strings of fine silver curlies came of the edge and the disc pealed like a bell. When it was 150 mm in diameter my lathe chuck could hold the disc using the outside jaws so I could accurately drill and tap the centre hole. .

Drilled 16.6mm hole, threaded M18 hole. Put a 17.9 mm should on the rod and cut the M18 thread.
Now that I know what to do I might make a couple more to save me changing grits.

I could also have bought a couple of fine grit belts for my big (2m x 150mm) belt sander but I think this disc is more to scale, plus I have heaps of fine grit no-hole discs that are sitting in a cupboard doing nothing.