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I just put the tube over the dremel sanding drum and tighten the drum.
Depending on how well I made the tube, sometimes I have to wrap the drum with a piece of tape for the tube to be snug.

That link has been broken for several years and it looks like Toxic has been inactive for several years as well.

Let me see if I can remember how this is done.
1. Take a sheet of sandpaper and cut a strip 1.57 inches wide
2. Take a 1/2 inch diameter rod (I think he used an acrylic rod) and lube it up with...