Sorry for the small size, just couldn't make it larger. [You can enlarge the image by holding down the "Ctrl" key on your computer keyboard and then tapping the "+" key, located just to the left of the "Backspace" key. To return to normal size, tap the "_" key just to the left of the "Plus" key]. This was printed in Chip Chats carving magazine a long time ago, also here on the forum, but I think it may help some new people.
For portable use I cut about 4" of all thread rod and stack the sanding strips on it in the manner shown, securing them with a washer and nut on each side. I use it in a 1/2" variable speed drill from Harbor Freight [aprox. $30]. Make up a couple in different grits. Besides working great, they're FREE.
I recently used my router speed control [$20 Harbor Freight] to cut the speed on my angle grinder for close detail work.
When carving a smaller horizontal log for a "Bear in a Log", I was having trouble securing it. What I did was secure a 2"x6" to a bench, having it hang out a bit. Then I secured the log to it with a heavy duty black rubber tie down strap with the metal hook ends you can buy at the auto supply or hardware stores. Hope these tips can help other carvers. Jim