> A narrow strip of coarse sandpaper stapled, thumbtacked or glued to one
> side of a piece of scrap 1/4 inch thick woodstrip does the same job for
> almost no cost. Unlike a file, the sandpaper cuts on both the push and
> pull strokes.

> If you are looking for a marketable tool, figure out some way to chuck
> this sandpaper covered strip into a sabersaw or reciprocating saw so that
> you have an electric motor pushing and pulling it back and forth. Perhaps
> you could wire it or epoxy glue it to an old saber sawblade, and chuck the
> sawblade in the sabersaw. A variable speed sabersaw would allow you to
> work at a slow but steady speed to maximize cutting, but reduce heat build
> up from friction. You would not want to lubricate the sliding wood strip
> with anything that might later interfere with the glue that bonds the
> boat's strips together.

> A spacer block under the sabresaw could be constructed that would
> accurately guide the sanding strip and leep it at the right angle. With
> the saw doing the pushing and pulling, all you would have to do is guide
> this slowly along the edge of the strip, working carefully around the
> forms.

> Of course, if you simply constructed the fence arrangement you could
> forget the file or sanding stick, and simply cut away the excess wood from
> one strip or both strips . I think that idea has been proposed already,
> but in reference to using a circular saw. with a circular saw you could
> adjust the depth so that you cut through the strips and would barely notch
> the undrlying forms. With a sabresaw you would have to remove the saw at
> each form, and the reinsert it on the other side of the form.

> Paul G. Jacobson

Come to think of it, why not use a Dremot tool -- not sure the spelling. It is very light and easy to control. Just drill the base and glue two nail directly opposite each other relative to the spiral cutter ; in other word, two nail and the cutter in a straight line with the cutter in the middle( sort of like , o ' ) Clip the two nails. The nail will bcome the guiding pins. Slip the nail between the gap and cut away. It should work, right! Who wants to be the guinea pig. Let me know the result.