Made this rasp from an old broken band saw blade.
Several cut to size (whatever they are - about 200mm) and a total of 9mm diameter means it's a very useful tool for making slots in wood (I'm a wooden toymaker) that are, well, 9mm wide
Having arthritic hands and a wood lathe means I just had to make some handles for it. A bit over the top, but I enjoy having a play.
An oversize hole allows the blade(s) to be firmly pushed in and epoxied in, not that they really need the epoxy.
Thanks for having a look.