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Chris,
The flexible sanding block you're referring to
comes from the Eastwood Company, (eastwood.com) and is part number 31144.
It's 21" long and when I bought mine, several years ago, it was the longest one
they had. Now I see they have longer ones up to 36" in length, but I like
the 21" one. They also have shorter ones. Eastwood also has sticky
back sandpaper in rolls. I use 40 grit on bare composites and 80 grit on
primered surfaces. The sanding block has a metal surface to stick the
sandpaper and 3 inserted rods that can be added or removed to change the
flexibility of the board. Unfortunately you still have to manually move it
back and forth to get the job done. The Eastwood catalog has a lot of
things I've found handy in airplane building.
Leighton Mangels
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