Ok.. So here is my major contribution to the forum.
Violin-makers and other instrument makers have very unique tools, and are used to making and modifying their tools for specific and unique jobs. As far as I know, there aren't any jigs ideal for small finger planes, from 1" in length, to 1-1/2".
This is how I figured out how to sharpen my finger plane blades (rounded) on my Tormek..
Its basically a small C-clamp torqued on very tight. Its rounded so you can turn it to accomomdate the shape of the edge of a rounded plane blade. It works really well and I great a great edge.
(http://www.maestronet.com/forum/index.php?act=attach&type=post&id=2142)
(http://www.maestronet.com/forum/index.php?act=attach&type=post&id=2143)
Sorry for the large pictures. If you save them you can see them in full.